In a complex investigation, handling of evidence should be designated to whom?

In a complex investigation, handling of evidence should be designated to the evidence custodian. This role is critical because the evidence custodian is specifically trained and designated to manage, secure, and preserve evidence collected at the scene. Their responsibilities include ensuring proper chain of custody, documenting how evidence is handled, and maintaining environmental control to prevent contamination or degradation.

The evidence custodian's expertise ensures that all evidence is meticulously accounted for, which is vital for maintaining the integrity of the evidence in legal proceedings. This practice also helps avoid potential challenges in court based on mishandling or improper documentation of evidence.

In contrast, roles such as the investigator, incident commander, or patrol officer, while important in the overall investigation process, do not specialize in the nuances of evidence handling and preservation to the same extent as the evidence custodian. This specialization is essential in complex investigations where a high volume of evidence is often collected and where even small mistakes can have significant repercussions.