When is evidence most susceptible to contamination?

Evidence is most susceptible to contamination during the collection process. This is a critical phase where evidence is first being handled and transferred from its original location to a secure environment for further analysis. If proper techniques and precautions are not employed, the potential for contamination is significant. For instance, if investigators do not wear appropriate personal protective equipment or use clean tools to collect samples, they may inadvertently introduce foreign substances or compromise the integrity of the evidence.

At this stage, environmental factors, improper handling, or the use of contaminated tools can all lead to cross-contamination. Since the initial collection is foundational to the evidentiary chain, maintaining the purity of evidence at this stage is crucial to ensure its reliability in subsequent legal proceedings. Thus, ensuring strict protocols during the collection of evidence is paramount to uphold its authenticity and utility in investigations.