What is a necessary step after completing an interview with a suspect?

Archiving the interview notes is a necessary step after completing an interview with a suspect because it ensures that all information gathered during the interview is preserved for future reference. Proper documentation is crucial in criminal justice, as it allows investigators to maintain an accurate record of the case, facilitating subsequent analysis, potential follow-up interviews, and legal proceedings. Archived notes can help provide context during investigations and may serve as evidence in court.

While it may be important to conduct follow-up interviews or to ensure legal representation for the suspect, these actions are not a direct continuation of the interview process itself. Recording the suspect's demeanor can also be relevant, but the primary necessity is to ensure that an accurate record of the interview exists, which is why archiving the notes takes precedence in this scenario.