The Madras High Court has reiterated an important principle concerning the proof of bigamy, holding that a DNA test is not essential to establish the commission of the offence and that the existence of a child from an alleged second relationship cannot, by itself, establish that a legally valid second marriage had taken place. The ruling is significant because it places the legal focus where it properly belongs: on the solemnisation and validity of the alleged second marriage, rather than on biological paternity. The Court’s approach also reflects a larger judicial caution against treating DNA evidence as a universal shortcut for resolving matrimonial and criminal disputes when the fact sought to be proved is capable of being established through conventional evidence.
The issue arose in proceedings concerning an allegation that a man had entered into a second marriage while his first marriage was still subsisting. A DNA examination had been sought on the premise that establishing a biological relationship between the man, the woman alleged to be his second wife and the child born from their relationship would assist in proving the allegation of bigamy. The underlying assumption was that if biological paternity were established, it would strengthen the case that the man had maintained a marital relationship with the second woman. The Court, however, approached the matter from the standpoint of the legal ingredients of bigamy and found that the proposed scientific examination could not itself establish the crucial fact required by law—the solemnisation of a valid second marriage.
That distinction is fundamental to criminal law. Bigamy is not committed merely because a person has a relationship with another woman or man during the subsistence of a marriage. Nor does the birth of a child from such a relationship, however compelling the surrounding circumstances may appear, automatically prove that the parties entered into a legally recognised marriage. The offence depends upon the existence of a subsisting first marriage and the subsequent solemnisation of another marriage in circumstances prohibited by law. The prosecution must therefore establish the second marriage as a legal fact.
The Court’s reasoning is consistent with a long line of judicial decisions which have insisted that the essential ceremonies or requirements constituting the alleged second marriage must be proved. The principle has particular importance in cases governed by Hindu law, where the validity of a marriage can depend upon compliance with the ceremonies recognised by the applicable personal law or custom. Merely describing two people as husband and wife, showing that they lived together, producing evidence of intimacy or establishing that they had a child does not necessarily satisfy the statutory requirement of proving a valid marriage.
This distinction prevents an important category of relationships from being automatically criminalised. Two adults may live together without being legally married. They may have a child without undergoing the ceremonies necessary for a valid marriage. Their relationship may have social, emotional or even matrimonial characteristics, but criminal liability for bigamy cannot be inferred merely from the existence of such circumstances. The prosecution must establish the legal fact of marriage in accordance with the applicable law.
The question before the Court was therefore not whether DNA technology is scientifically capable of establishing biological paternity. It plainly is. The more important question was whether paternity is legally relevant to proving the particular offence alleged. The Court’s answer, in substance, was that DNA evidence cannot substitute for proof of the second marriage itself.
This is an important distinction in criminal evidence: evidence may be scientifically conclusive about one fact while remaining legally insufficient to establish another fact that constitutes an essential ingredient of the offence.
A DNA test can establish, with a very high degree of scientific certainty, whether a particular person is biologically related to a child. But even if a man is conclusively established to be the biological father of a child born to another woman, that does not necessarily prove that he married the child’s mother. The biological relationship and the legal relationship are two different questions.
This principle has previously been recognised by the Madras High Court in cases involving allegations of bigamy. The Court has observed that a child may be born from a relationship between an unmarried man and woman and that such birth cannot, by itself, establish that the parties had undergone a valid marriage. The prosecution must independently prove the second marriage and the ceremonies or requirements necessary for its validity.
The Supreme Court has also recently reinforced the caution surrounding DNA examinations in matrimonial and criminal proceedings. In a January 2026 decision arising from proceedings before the Madras High Court, the Supreme Court set aside an order permitting a DNA test in a case involving allegations of cruelty and bigamy. The apex court emphasised that compulsory DNA testing constitutes a serious intrusion into privacy and personal liberty and cannot be ordered routinely. It also specifically observed that other evidence could be considered for determining whether an allegation of bigamy had been established.
The Supreme Court’s intervention is particularly relevant because it places scientific evidence within the constitutional framework of privacy and proportionality. Modern forensic technology has transformed the capacity of courts and investigators to establish biological relationships. But the existence of sophisticated technology does not mean that courts should order its use whenever a litigant believes that it may make the case easier to prove.
The principle is simple: necessity must precede scientific intrusion. A DNA test involves the extraction and analysis of highly personal genetic information. Such information is intrinsically connected with a person’s biological identity and can potentially reveal information extending far beyond the immediate dispute. The right to privacy recognised under Article 21 therefore becomes relevant whenever a person is compelled to undergo genetic testing.
The Supreme Court’s approach in the recent case reflects the threefold constitutional requirement of legality, legitimate State purpose and proportionality before personal liberty or privacy can be substantially interfered with. A court must therefore ask not merely whether a DNA test could produce useful information, but whether the information is genuinely necessary for deciding the dispute and whether the same issue can be resolved through less intrusive evidence.
That reasoning is particularly persuasive in a bigamy prosecution because the scientific test may answer a question that is not the decisive legal question. If the prosecution’s case is that the accused solemnised a second marriage, the relevant evidence may include witnesses who attended the ceremony, photographs or video recordings, marriage invitations, temple or religious records, registration documents, admissions, communications between the parties, evidence concerning the performance of legally recognised ceremonies and other circumstances demonstrating that the marriage actually took place.
The DNA report cannot replace that evidence. The importance of this principle becomes clearer when the legal ingredients of bigamy are examined. Under the earlier Indian Penal Code framework, Section 494 criminalised marrying again during the lifetime of a husband or wife, subject to the statutory exceptions. Under the Bharatiya Nyaya Sanhita, 2023, the corresponding offence is now dealt with under Section 82. The essential concept remains substantially the same: the prosecution must establish the existence of a legally relevant first marriage and the subsequent marriage during its subsistence.
The second marriage is therefore not a peripheral fact. It is at the heart of the offence.
This explains why courts have repeatedly insisted upon proof of the ceremonies required to constitute the alleged marriage. In Kanwal Ram v. Himachal Pradesh Administration, the Supreme Court emphasised that in a prosecution for bigamy, the alleged second marriage must be proved in accordance with law. Merely producing an admission or evidence suggesting a relationship between the parties cannot automatically substitute for proof of solemnisation.
The principle was subsequently applied in several cases involving alleged second marriages. The Madras High Court in K. Neelaveni v. S.K. Sivakumar specifically rejected the argument that a DNA examination could establish bigamy where the investigating agency sought to prove the alleged second marriage through the birth of a child. The Court observed that even if a child was born from the relationship, that fact did not establish that a valid marriage had taken place. The significance of the present ruling lies in its reaffirmation of that evidentiary discipline.
There is a tendency in contemporary litigation to regard scientific evidence as inherently superior to other forms of proof. DNA evidence undoubtedly possesses extraordinary probative value in questions of biological identity. But the law of evidence does not operate on the principle that the most technologically advanced evidence must always be preferred. Relevance remains the first requirement.
A perfect answer to the wrong question does not prove the right fact. This is perhaps the most important legal lesson emerging from the decision.
If the issue is whether a man is the biological father of a child, DNA testing may be directly relevant. If the issue is whether the man legally married the child’s mother, DNA testing may be only indirectly relevant, and in many cases it may have little or no capacity to prove the essential ingredient.
The distinction is also important for protecting children from becoming instruments of matrimonial litigation. A dispute between two adults should not automatically expose a child to invasive scientific testing, particularly where the test is not necessary for resolving the actual criminal charge. The Supreme Court has specifically cautioned against the routine use of DNA testing in circumstances that could result in the stigmatisation of a child or unnecessary intrusion into family privacy. The concern is not merely emotional. It has constitutional and evidentiary dimensions.
A child is not a piece of evidence to be mechanically examined whenever one parent disputes a relationship. The court must consider the child’s dignity, privacy and legitimate interests alongside the evidentiary needs of the parties.
This becomes even more important where the proposed DNA examination is sought by a third party to establish an allegation of bigamy. The child may have no connection whatsoever with the dispute concerning the validity of the alleged second marriage. Making the child’s biological identity the centrepiece of the prosecution can unnecessarily shift the focus from the conduct of the accused adults to the status of the child. The Court’s approach consequently reinforces a child-sensitive dimension of evidence law.
At the same time, the decision should not be interpreted as saying that DNA evidence is never permissible in matrimonial or criminal proceedings. Indian courts have permitted DNA examinations in appropriate cases where biological identity or paternity is directly in issue and where the test is necessary for resolving the dispute. The Supreme Court’s recent decision itself does not create an absolute prohibition. Rather, it requires courts to exercise caution and ensure that the circumstances justify such an intrusive measure. The question is therefore one of context, necessity and proportionality.
For instance, where paternity itself is a foundational fact in a case concerning maintenance, inheritance, legitimacy or a particular criminal allegation, DNA evidence may possess considerable relevance. But where the ultimate issue is whether a marriage ceremony was performed, a DNA test cannot be used as a substitute for evidence of the ceremony.
This is precisely where the distinction between matrimonial proceedings and criminal prosecution becomes important. The standard and purpose of proof may differ depending upon the proceeding. In a maintenance case, courts may adopt a more flexible approach to determining the existence of a marital relationship. In a prosecution for bigamy, however, criminal liability requires strict proof of the ingredients of the offence. The consequences of conviction make it inappropriate to infer a legally valid second marriage merely from circumstances that may be sufficient for a different matrimonial or maintenance claim.
The law must therefore resist the temptation to apply one evidentiary standard mechanically across different proceedings. A long-standing relationship, joint residence and social recognition may be relevant in one context. But a prosecution for bigamy requires the prosecution to cross the specific statutory threshold applicable to that offence.
This distinction also protects individuals against criminal prosecution based upon assumptions about their personal relationships. The law does not criminalise adultery merely because a person is involved in an extramarital relationship. Nor does it automatically criminalise cohabitation. Bigamy is a specific offence concerned with the solemnisation of another marriage while the first marriage subsists.
The elements of the offence cannot be expanded merely because the surrounding relationship appears morally objectionable. This is an important constitutional principle. Criminal law must remain anchored to statutory ingredients rather than social morality.
The Madras High Court’s approach therefore reflects the broader rule that courts cannot fill evidentiary gaps in a criminal prosecution through assumptions. If the prosecution has not produced evidence demonstrating that the alleged second marriage was solemnised, it cannot overcome that deficiency simply by seeking DNA testing of the parties and a child.
The same principle applies in reverse. If there is credible independent evidence of the second marriage, the absence of DNA evidence does not weaken the prosecution’s case merely because no genetic examination was conducted. DNA is therefore neither a mandatory ingredient nor a substitute for legally required proof.
This also has implications for investigative agencies. Police investigating allegations of bigamy must focus their investigation upon the actual elements of the offence. If the allegation concerns a second Hindu marriage, investigators should examine whether the requisite ceremonies were performed, who attended them, where the ceremony took place, whether there are documentary records and what evidence exists concerning the solemnisation. Merely establishing that the accused and another person had a child may not advance the investigation sufficiently.
The Court’s reasoning consequently offers practical guidance to investigators as well as trial courts.An investigation must be ingredient-oriented.
Investigators should first identify what must legally be proved and then collect evidence capable of proving those elements. Scientific evidence should be used where it answers a material question, not simply because it is technologically available.
This is particularly important in the post-BNS criminal justice system, where investigators and courts are increasingly expected to use forensic methods. The greater emphasis on forensic investigation under India’s new criminal laws should not be misunderstood as a direction to subject accused persons and witnesses to scientific tests in every case. Forensics must remain connected to relevance and necessity.
The law’s increasing reliance on technology should therefore be accompanied by an equally strong understanding of constitutional safeguards.
The privacy dimension is particularly significant because genetic information is fundamentally different from ordinary documentary evidence. Once DNA is collected, it can potentially reveal biological relationships and other sensitive information. The Supreme Court’s recent jurisprudence makes it clear that personal liberty cannot be sacrificed merely in the name of investigative convenience.
The present controversy also demonstrates why judicial orders directing DNA tests must contain detailed reasons. A court cannot simply state that the DNA report would constitute “additional evidence” and therefore direct the test. The Court must explain what precise fact the test will establish, why that fact is relevant, why existing evidence is inadequate and why the intrusion is proportionate.
A cryptic order is particularly problematic where fundamental privacy interests are involved. The requirement of reasoned judicial orders is not a procedural formality. Reasons demonstrate that the court has applied its mind to the competing interests involved. They also enable appellate courts to examine whether the decision was legally justified.
This principle has relevance far beyond DNA testing. Whenever courts are asked to order invasive medical or forensic examinations, the order should demonstrate a clear connection between the proposed test and the issue before the court. The broader jurisprudential message is therefore one of evidence before technology.
Scientific tools can dramatically improve the search for truth, but the legal system must first determine what truth is relevant to the dispute. A DNA test may reveal biological truth, but criminal law sometimes asks a different question whether a legal ceremony took place, whether a contract was executed, whether consent was given or whether a statutory condition was satisfied. Biology cannot answer every legal question.
The bigamy context makes this especially clear. Marriage is a legal institution. Its existence depends upon statutory requirements, personal law and, where applicable, customary ceremonies. Biology may establish that two people are genetically related to a child, but it cannot itself establish that the parties underwent the legally necessary process of entering into marriage. The Court’s approach therefore protects the conceptual distinction between biological relationship and legal status.
That distinction is also visible in other areas of family law. A person may be a biological parent without being the legal guardian of a child. A couple may have a biological child without being legally married. Conversely, legal parentage can sometimes exist without biological parentage, particularly in contexts involving adoption or assisted reproduction. Law and biology overlap, but they are not identical.
The legal system must therefore resist biological reductionism. Another important dimension is the potential social consequences of DNA testing. A test can conclusively establish a biological relationship, but its consequences may extend into questions of legitimacy, inheritance, family identity and social status. The Supreme Court has therefore repeatedly stressed caution in ordering such examinations.
The possibility that a scientific test could cause irreversible consequences is a reason for judicial restraint, not a reason to avoid scientific evidence altogether. The appropriate approach is to ask whether the evidentiary benefit is sufficiently significant to justify the intrusion.
In the present context, the answer is particularly clear because the DNA test does not establish the central ingredient of bigamy. Even a positive result would show biological paternity, not the solemnisation of marriage. The evidentiary gain is therefore insufficient to justify treating the test as indispensable.
The ruling also has significance for the rights of women involved in alleged second relationships. Allegations of bigamy can carry serious social consequences, particularly for a woman accused of being a “second wife”. Courts must be careful not to treat allegations concerning her personal relationship as established facts merely because a child was born from the relationship.
The criminal process must establish the legal facts objectively. This is particularly important because family disputes frequently contain allegations of adultery, illegitimate relationships, desertion and bigamy. If courts permit invasive testing whenever such allegations are made, matrimonial litigation could become a mechanism for intrusive investigation into the most private aspects of family life.
The constitutional right to privacy requires a more disciplined approach. The decision also underscores the importance of protecting the dignity of children born outside legally recognised marriages. The legal system has progressively moved away from treating such children as responsible for the circumstances of their birth. Modern jurisprudence, including the Supreme Court’s interpretation of Section 16 of the Hindu Marriage Act, has recognised important legal protections for children born from void or voidable marriages. The status of the parents should not become a basis for stigmatising the child.
A DNA examination sought primarily to establish bigamy can therefore raise concerns that extend beyond the immediate criminal case. The judiciary’s insistence that the offence be proved through evidence of the marriage itself helps keep the child’s biological identity outside the dispute unless it is genuinely relevant.
The ruling should also be read alongside the principle that criminal courts must avoid drawing conclusions from mere cohabitation when the statute requires proof of a valid marriage. Courts may draw appropriate inferences from conduct where legally permissible, but the inference cannot replace proof of an essential ingredient.
This is particularly significant because modern social relationships are increasingly diverse. Long-term cohabitation, live-in relationships and non-traditional domestic arrangements do not automatically satisfy the statutory definition of marriage. Criminal law must recognise that distinction.
At the same time, the decision does not weaken the legal protection against bigamy. Where a person deliberately contracts a second valid marriage while the first subsists, the law remains fully capable of imposing criminal consequences. The judgment merely insists that the prosecution prove the offence using evidence directed towards the actual statutory ingredients.
That is not a technical obstacle. It is a fundamental requirement of criminal justice. A conviction cannot rest upon what appears probable in a social sense. It must rest upon what is legally proved.
The decision also reinforces the broader proposition that the burden of proof cannot be shifted merely because a scientific test is available. The prosecution must establish its case through legally admissible evidence. The accused cannot be required to undergo invasive testing merely because such testing might make the prosecution’s task easier. This is consistent with the constitutional principle that the State bears the burden of establishing criminal guilt.
The Article 20(3) protection against compelled self-incrimination and the Article 21 guarantee of personal liberty and privacy form part of the wider constitutional environment in which forensic examinations must operate. While the Supreme Court has recognised that physical evidence is not always equivalent to testimonial compulsion, any compulsory bodily examination must still satisfy statutory and constitutional requirements.
The law therefore does not treat DNA testing as an ordinary procedural step. It is an exceptional evidentiary tool whose use must be justified by the facts of the particular case. The present ruling consequently offers an important corrective to the growing perception that DNA evidence is the ultimate answer to every disputed question of family identity. It is extraordinarily powerful when the question is biological. But the law frequently asks questions that biology cannot answer.
Was there a marriage? Was the marriage solemnised according to the applicable law? Were the essential ceremonies performed? Was the first marriage still legally subsisting? These are legal and evidentiary questions, not simply genetic ones. The prosecution must therefore build its case around the evidence capable of answering those questions.
In this sense, the Madras High Court’s approach is both technically correct and constitutionally valuable. It prevents scientific evidence from becoming a shortcut around the statutory requirements of criminal prosecution and protects individuals, particularly children, from unnecessary intrusion into their genetic identity.
The ruling also offers a broader lesson for matrimonial litigation: not every disputed fact requires the most invasive form of evidence available. Courts must first identify the precise issue, determine the evidentiary requirement and then select the least intrusive method capable of resolving it. That is the essence of proportionality in evidentiary adjudication.
The ultimate significance of the decision therefore lies not merely in the proposition that a DNA test is “not essential” to prove bigamy. Its deeper message is that criminal courts must remain faithful to the structure of the offence. Bigamy is about the unlawful solemnisation of a second marriage, not merely about an intimate relationship, cohabitation or biological parenthood.
Where the prosecution alleges a second marriage, it must prove that marriage. Where it alleges paternity, it may, in an appropriate case, use DNA evidence. The two propositions must not be conflated. The judgment is consequently a useful reminder that the search for truth in a courtroom is not simply a search for every scientifically discoverable fact. It is a search for those facts that the law treats as relevant to determining liability. The more intrusive the investigative method, the stronger must be the justification for employing it.
In the final analysis, the Court’s approach protects three principles simultaneously: the integrity of criminal proof, the privacy and dignity of individuals, and the legal distinction between biological relationships and marriage. It does not make DNA evidence irrelevant. It simply places DNA technology in its proper legal position as a powerful evidentiary instrument that must be used when genuinely necessary, and not as a substitute for proving the essential ingredients of an offence.
For allegations of bigamy, that distinction is decisive. A child may establish a relationship. A DNA report may establish biological parentage. But neither, standing alone, establishes that a second marriage was solemnised. That fact must still be proved in accordance with law.
