Evidence least vulnerable to a chain of custody challenge in a court of law would...

Evidence marked in permanent ink by one person is least vulnerable to chain of custody challenges. Proper marking ensures that the evidence is identifiable and traceable to the collector, reducing the likelihood of tampering or misidentification. Maintaining a clear and secure chain of custody is critical for ensuring the admissibility of evidence in court.

ASIS Certified Protection Professional (CPP®) References:

Evidence Handling and Chain of Custody: CPP materials emphasize proper collection, marking, and documentation techniques to maintain the integrity of evidence.

Legal and Ethical Standards in Investigations: Detailed procedures for chain of custody are covered in CPP investigative modules.