Chain of Custody Procedures and Documentation Questions
Comprehensive mastery of chain of custody practices covering the full lifecycle of physical or digital evidence. Candidates should understand evidence identification and tagging, secure collection techniques, how to log who handled evidence and when, and required metadata such as reason for handling and duration of custody. Include procedures for secure transport and transfer with signed transfer logs, storage and access control practices, environmental and tamper protections, and maintenance of audit trails and analysis documentation that link evidence to investigative findings. Be prepared to discuss legal compliance and admissibility concerns, how breaks in the chain are detected and mitigated, jurisdiction specific requirements and retention policies, documentation formats and recordkeeping best practices, and how to design, implement, or improve organizational protocols to prevent chain breaks. Interviewers may probe for examples of policies, handling checklists, training practices, incident handling when chain integrity is threatened, and metrics used to measure process compliance.
HardTechnical
62 practiced
In Python 3, implement a command-line utility 'coc_sign.py' that: (1) accepts a JSON transfer-log file, (2) creates a canonical representation of the JSON, (3) signs the canonical data with an RSA private key producing a detached signature, (4) writes the signature to a .sig file, and (5) supports a 'verify' mode that validates the signature using the provided public key. State any third-party libraries you would use (for example, 'cryptography') and outline how you would log the signing event in a local append-only audit file. Assume keys exist; focus on canonicalization, signing, verification, and secure private key handling.
HardTechnical
59 practiced
You are the lead forensic examiner in a high-priority live incident affecting hundreds of endpoints. Propose a prioritized plan to capture volatile evidence and maintain defensible chain-of-custody without delaying containment. Include triage prioritization, minimal in-field documentation templates, roles for on-site vs remote teams, legal authorization capture, and escalation criteria for preserving volatile artifacts.
MediumSystem Design
59 practiced
Design a high-level architecture for an immutable audit-trail system that records every custody event across multiple labs and is defensible in court. Compare append-only logs on hardened storage, WORM archival, and a permissioned blockchain approach. Describe ingestion, indexing, verification methods (cryptographic attestations), retention, searchability, and how to make the system auditable by external parties.
EasyTechnical
53 practiced
You're assigned to tag items seized at a crime scene including a laptop, a USB stick, and printed documents. Specify a clear labeling schema for unique identifiers (format example), the minimum metadata fields you would record for each item, how you would link photographs to the written log, and one practical step to prevent duplicate IDs across a multi-team response.
MediumTechnical
63 practiced
Your investigation requires evidence from a foreign cloud tenant hosted in another country. Outline the legal and procedural chain-of-custody steps you must follow to request, receive, and store that evidence while complying with both origin and destination jurisdictions. Mention MLATs, preservation orders, local counsel, provider cooperation, timing, and documentation needed to support admissibility and privacy compliance.
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