Why is it often necessary to interview suspects more than once?

The need to interview suspects multiple times primarily stems from the possibility that they might provide new information or make contradictory statements upon further questioning. This occurs because the initial stress of the interrogation can affect their memory and the way they present their narrative. Over time, as they reflect on their circumstances and the questions posed, they may remember additional details or feel more comfortable disclosing information that they initially withheld. This iterative process can help investigators highlight inconsistencies in a suspect's statements, which may be crucial for resolving a case and uncovering the truth.

Additionally, the dynamics of questioning can prompt subjects to reconsider their responses, leading to a deeper understanding of the events surrounding the investigation. The ability to revisit previous answers and delve into specific details can uncover insights that were missed in the initial interviews.