At what point in an investigation will a criminal analyst become involved in the chain of custody of any evidence?

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The key idea is who is responsible for starting and maintaining the chain of custody. The chain of custody is the documented trail that shows who has handled evidence and when, from the moment it is collected until it is presented in court. That responsibility sits with the investigators and the evidence custodians within the agency, who create and maintain the custody records and secure the evidence.

A criminal analyst is brought in to examine the evidence and produce analysis, but they do not start or take ownership of the custody trail. They work under the established chain of custody and must preserve it while handling the evidence, reporting any changes or breaks, but the formal initiation and ongoing management of custody lie with the investigators and evidence control personnel. Because of that separation of roles, there isn’t a distinct point in the investigation where the analyst becomes the custodian of the chain; custody duties are not transferred to them. That’s why this option reflects that the analyst does not become involved in the chain of custody as a custody event, hence the answer.