What is the main purpose of interrogation in a criminal investigation?

The primary goal of interrogation in a criminal investigation is to obtain a confession from a suspect. Confessions can be a critical component of gathering evidence, as they provide direct insight into the suspect's involvement in the crime. A confession can not only clarify the facts of the case but can also corroborate other evidence that investigators may have collected, making it a powerful tool in building a case.

Interrogation techniques are designed to create an environment conducive to obtaining this confession, utilizing psychological tactics that encourage honesty and openness from the suspect. The effectiveness of an interrogation is often evaluated by how well the interrogators can communicate and connect with the suspect, leading them to admit to their actions willingly.

On the other hand, collecting evidence without oversight, intimidating suspects, or gathering witness testimonies serve different purposes in the investigation process. Each of those activities might play a role in the overall investigation but does not capture the primary objective of interrogation itself, which revolves around obtaining a confession.