1. Meaning of Chain of Custody (Electronic Evidence)

Chain of custody (CoC) refers to the chronological documentation of possession, handling, transfer, storage, and analysis of electronic evidence from the moment it is collected until it is presented in court.

In digital evidence, CoC ensures:

• Evidence is not tampered with
• Source is traceable
• Integrity is preserved (hash value consistency)
• Admissibility in court is not questioned

Courts treat electronic evidence as highly vulnerable because it can be:

• Easily edited
• Cloned/copied
• Altered without visible trace

2. Legal Framework in India

(A) Indian Evidence Act, 1872

• Section 65A & 65B → Governs electronic records
• Section 62–65 → Primary/secondary evidence rules (limited application for electronic records)
• Section 45A → Expert opinion on electronic evidence

(B) IT Act, 2000

• Recognizes electronic records legally
• Supports digital signatures and authenticity mechanisms

(C) Criminal Procedure Code (CrPC)

• Sections 91, 165, 293 CrPC → seizure, production, forensic reports

3. Key Requirements of Chain of Custody in Electronic Evidence

A legally acceptable chain of custody generally includes:

1. Collection Stage

• Device seizure (mobile, laptop, CCTV DVR)
• Documentation of condition
• Witnessing by independent officers

2. Preservation

• Use of write blockers
• Creation of forensic image (bit-by-bit copy)
• Hashing (MD5/SHA-256 values)

3. Transportation

• Sealed packaging
• Logs of movement

4. Storage

• Secure forensic lab storage
• Restricted access logs

5. Examination

• Only forensic experts analyze copied image, not original device

6. Presentation in Court

• Certificate under Section 65B(4) (where applicable)
• Forensic report + chain documentation

4. Leading Case Laws on Electronic Evidence & Chain of Custody

Below are important Supreme Court / High Court decisions explaining admissibility, certification, and integrity:

1. Anvar P.V. v. P.K. Basheer (2014) 10 SCC 473

Key Principle:

• Section 65B certificate is mandatory for admissibility of electronic records as secondary evidence.

Relevance to CoC:

• Courts emphasized that authenticity must be ensured through procedural safeguards, not oral testimony alone.

2. Tomaso Bruno v. State of Uttar Pradesh (2015) 7 SCC 178

Key Principle:

• Electronic evidence like CCTV footage is relevant and important.
• Courts should rely on scientific evidence where available.

CoC Aspect:

• Stressed importance of proper preservation of CCTV footage and integrity of records.

3. Shafhi Mohammad v. State of Himachal Pradesh (2018) 2 SCC 801

Key Principle:

• Relaxed requirement of Section 65B certificate in cases where party does not have control over device.

CoC Insight:

• Recognized practical issues in maintaining custody of electronic devices in investigations.

(Later partly overruled)

4. Arjun Panditrao Khotkar v. Kailash Kushanrao Gorantyal (2020) 7 SCC 1

Key Principle:

• Section 65B certificate is mandatory condition precedent for admissibility.
• Overruled Shafhi Mohammad.

Chain of Custody Importance:

• Reinforced that authenticity must be proven through proper device handling + certification + forensic integrity.

5. State (NCT of Delhi) v. Navjot Sandhu (Parliament Attack Case) (2005) 11 SCC 600

Key Principle:

• Earlier allowed secondary evidence without strict 65B compliance (later overruled).

CoC relevance:

• Highlighted early challenges in maintaining electronic evidence integrity in terrorism cases.

6. Sonu @ Amar v. State of Haryana (2017) 8 SCC 570

Key Principle:

• Objections to electronic evidence must be raised at trial stage; otherwise may be deemed waived.

CoC importance:

• Reinforces that failure to challenge chain of custody early weakens later objections.

7. Kundan Singh v. State (2015) Delhi High Court

Key Principle:

• Electronic evidence must show clear chain of custody and authenticity.

CoC focus:

• If tampering possibility exists, evidence becomes unreliable.

8. Ravindra Singh v. State of UP (Allahabad High Court, 2019)

Key Principle:

• Electronic evidence without proper seizure memo and custody trail is unreliable.

CoC emphasis:

• Courts must ensure forensic handling procedures are properly documented.

5. Judicial Standards for Accepting Chain of Custody

Courts generally examine:

(A) Integrity

• Has the data changed since seizure?

(B) Continuity

• Is every transfer documented?

(C) Authenticity

• Is the source device identifiable?

(D) Forensic Validation

• Hash value matching (before & after analysis)

(E) Certification

• Section 65B certificate compliance

6. Practical Problems in India

Courts frequently face issues such as:

• Missing seizure memos
• No hash value records
• Broken custody chain
• Uncertified screenshots/WhatsApp chats
• Tampered mobile data
• CCTV overwriting due to delay

These often result in acquittals or evidence rejection, as seen in several trial court decisions.

7. Summary (Core Legal Position)

• Electronic evidence is admissible only if authenticity + integrity are proven
• Section 65B certificate is mandatory (Arjun Panditrao case)
• Chain of custody ensures evidence is not altered
• Courts rely heavily on forensic procedures + documentation trail