The nurse working in an emergency department collects physical evidence 6 hours following a reported sexual assault. After placing the samples in sealed containers, which action is most important for the nurse to implement?

Assist the client with toileting, hygiene, and dressing with clean clothes.

Document the characteristics of the various sites of sample collection.

Maintain possession of the evidence collection kit at all times until submitted to law enforcement.

Provide discharge instruction for prophylactic antibiotic, pregnancy, and HIV prevention medication.