Interrogation (also called questioning) is interviewing as commonly employed by law enforcement officers, military personnel, and intelligence agencies with the goal of eliciting useful information. Interrogation may involve a diverse array of techniques, ranging from developing a rapport with the subject to outright torture. Interrogation (also called questioning) is interviewing as commonly employed by law enforcement officers, military personnel, and intelligence agencies with the goal of eliciting useful information. Interrogation may involve a diverse array of techniques, ranging from developing a rapport with the subject to outright torture.