Fundamental Rights (Articles 14-22) and Forensic Practice

Part III of the Constitution houses the Fundamental Rights. Article 12 defines "the State" (the Union, States, Parliament, State Legislatures, local authorities and other authorities within India). Article 13 then locks the door: any pre-Constitution law inconsistent with Part III is void to that extent, and any post-Constitution law abridging a fundamental right is void from inception. That is the textual hook for judicial review and the reason a forensic statute or investigative practice can be struck down if it crosses an Article 20 or Article 21 line.

Enforcement runs through two writ jurisdictions. Article 32 lets a person move the Supreme Court directly for fundamental-rights enforcement, and Dr Ambedkar called it the heart and soul of the Constitution. Article 226 gives the High Courts a wider writ power covering both fundamental rights and other legal rights. The five writs (habeas corpus, mandamus, prohibition, certiorari, quo warranto) are the everyday remedies to challenge an illegal arrest, an unlawful sample collection, or a tainted custodial confession. Indian anchor: any sample, confession or detention that violates Articles 14, 20, 21 or 22 can be challenged by writ and the evidence flowing from it can be excluded.

The equality cluster opens with Article 14, which guarantees "equality before the law" (Diceyan, no person above the law) and "equal protection of the laws" (equal treatment in equal circumstances). Article 14 forbids arbitrary State action, which is why investigative agencies cannot pick and choose how they apply the Bharatiya Nagarik Suraksha Sanhita 2023 across similarly placed suspects. Reasonable classification is allowed if it rests on an intelligible differential with a rational nexus to the object sought.

Article 15 prohibits discrimination by the State on grounds of religion, race, caste, sex or place of birth, with enabling clauses for affirmative action. Article 16 guarantees equality of opportunity in public employment, the textual basis for reservations in CFSLs, SFSLs and police services. Article 17 abolishes untouchability; the penal framework sits in the Protection of Civil Rights Act 1955 and the SC and ST (Prevention of Atrocities) Act 1989, which generate significant casework for State and regional forensic laboratories. Article 18 abolishes titles other than military and academic distinctions, mostly tested as a one-line MCQ recall item.

For forensic practice the Indian anchor is uniform sampling: a magistrate cannot order DNA or voice samples from one accused on softer terms than another similarly placed accused, and the SC and ST Atrocities Act trial framework demands a high evidentiary standard backed by trained forensic support.

Article 19 gives every citizen six freedoms in clause (1): (a) speech and expression, (b) peaceful assembly without arms, (c) association or unions, (d) movement throughout the territory of India, (e) residence and settlement, and (g) practice of any profession or trade. Clause (f) (right to property) was deleted by the 44th Amendment in 1978. Each freedom is subject to reasonable restrictions listed in clauses (2) to (6) (sovereignty, integrity, public order, decency, morality, contempt of court, defamation, incitement to an offence, and so on). The freedom of profession in Article 19(1)(g) underpins the right of forensic experts and private laboratories to practise, subject to regulatory control.

Article 20 has three clauses, all examinable. Clause (1) bars ex-post facto criminal law: no person shall be convicted of an offence except for violation of a law in force at the time of the act, nor subjected to a penalty greater than that prescribed at the time. Clause (2) bars double jeopardy: no person shall be prosecuted and punished for the same offence more than once. Clause (3) bars self-incrimination: "no person accused of any offence shall be compelled to be a witness against himself". This last clause is the single most-tested provision on the forensic side, because it controls compelled narco, polygraph, brain-mapping, voice and handwriting sampling.

Article 21 is the master right. "No person shall be deprived of his life or personal liberty except according to procedure established by law." The post-Maneka Gandhi (1978) reading is that the procedure must be fair, just and reasonable. Article 21 has been read to include the right to live with dignity, the right to privacy (KS Puttaswamy 2017), the right to a fair trial, the right against custodial torture, and the right to legal aid. Every custodial-protocol and sampling judgment ultimately traces back to Article 21.

Article 22 has two halves. Clauses (1) and (2) protect any arrested person under ordinary criminal law: the right to be informed of the grounds of arrest, the right to consult and be defended by a legal practitioner of choice, and the right to be produced before the nearest magistrate within 24 hours of arrest, excluding journey time. Clauses (4) to (7) deal with preventive detention and require an advisory board for detentions beyond three months. The 24-hour rule and the grounds-in-writing rule are the textual basis for the BNSS arrest provisions and for the DK Basu custody guidelines.

The pivot for Article 20(3) is the distinction between physical (non-testimonial) evidence and testimonial evidence. The eleven-judge bench in State of Bombay v. Kathi Kalu Oghad (1961) held that giving fingerprints, palm impressions, footprints, specimen handwriting and signatures is not "being a witness" against oneself; it is the furnishing of evidence in a non-testimonial sense. That ruling is the constitutional licence for routine forensic sampling under what is now Section 348 of the BNSS 2023.

Selvi v. State of Karnataka (2010) drew the limit. The Supreme Court held that narco-analysis, polygraph testing and brain-electrical-activation profiling (BEOS) cannot be administered to an accused, suspect or witness without consent. Involuntary administration violates Article 20(3) (testimonial character) and Article 21 (mental privacy and a fair procedure). Even with consent, the test results are not by themselves admissible as substantive evidence; any independently verifiable material discovered as a result may be used under Section 27 of the Indian Evidence Act 1872 (now BSA 2023 Section 23 recovery proviso). The NHRC's 2000 Polygraph Guidelines were brought in by Selvi as procedural safeguard.

Nandini Satpathy v. PL Dani (1978) had earlier read Article 20(3) into the investigation stage, holding that the protection extends to police interrogation and that an accused has the right to consult counsel during questioning. Ritesh Sinha v. State of Uttar Pradesh (2019) then closed the circle for voice samples: a Judicial Magistrate can direct an accused to give a voice exemplar, by analogy with Section 73 of the Indian Evidence Act 1872 (now Section 348 of the BNSS 2023), and the direction does not violate Article 20(3).

MCQ synthesis: physical samples can be compelled; testimonial output (narco, polygraph, BEOS) cannot. The Indian anchor is the trio Kathi Kalu Oghad, Selvi and Ritesh Sinha, named in order.

The custodial side of forensic practice sits squarely under Article 21. The leading judgment is DK Basu v. State of West Bengal (1997), where the Supreme Court laid down eleven binding requirements for every arrest and detention: visible name tags, contemporaneous arrest memo attested by a family member or locality witness, intimation of arrest to a friend or relative, arrest-time medical examination, inspection memo, right to meet a lawyer during interrogation, and entry in a control-room register at the district and State headquarters. Non-compliance attracts departmental action and contempt. DK Basu was absorbed into Sections 41B, 41C, 41D, 50A and 54 of the CrPC 1973 and is now carried forward by Sections 35 to 43 and 53 of the BNSS 2023.

The Sanhita adds forensic teeth. Section 105 of the BNSS 2023 requires audio-video recording of search and seizure, with the recording produced before the magistrate without delay, a procedural safeguard rooted in Article 21 that anchors the chain of custody from the seizure stage. Section 176(3) of the BNSS 2023 mandates a forensic-expert visit and videographed scene work for offences punishable with seven years or more, which ties Article 21 protections to forensic science on the ground.

Custodial death and torture remain the highest-stakes Article 21 area. The Prakash Singh police reforms (2006) and the NHRC's standing custodial-death notification protocol flow from this reading. Confessions to a police officer remain inadmissible under Section 23 of the Bharatiya Sakshya Adhiniyam 2023 (formerly Sections 25 and 26 of the IEA 1872), the structural firewall against coerced confessions. Indian anchor: DK Basu plus Section 23 of the BSA, the custody-and-confession pair.

Article 22(1) and (2) survive in the operative arrest provisions of the Bharatiya Nagarik Suraksha Sanhita 2023, Sections 35 to 43 (formerly CrPC 1973 Sections 41 to 50A). Section 35 lays out when a police officer may arrest without a warrant and requires recording reasons in writing for both arrest and non-arrest in cases punishable up to seven years. Section 36 prescribes the procedure of arrest including identification badges and an arrest memo. Section 47 requires the arresting officer to inform the arrested person of the grounds of arrest and the right to bail in bailable cases. Section 48 requires intimation of arrest to a nominated friend or relative. Section 58 bars detention beyond 24 hours without magisterial authorisation, the textual restatement of Article 22(2).

Two pieces complete the picture. Article 39A of the Directive Principles (with Article 22(1)) requires the State to provide free legal aid, operationalised through the Legal Services Authorities Act 1987 and NALSA. Article 22(4) to (7) govern preventive detention statutes such as the National Security Act 1980, requiring an advisory board for detention beyond three months and grounds within five days (extendable to fifteen). NTA periodically tests the three-month review threshold as a stand-alone MCQ.

Indian forensic anchor: the 24-hour rule plus the production-before-magistrate requirement. Any sample, recovery or statement obtained after a delayed production becomes liable to challenge under Article 22 read with Article 21, and the BNSS investigation framework builds the timelines that meet the constitutional standard.