Though it might seem absurd, interrogators can all but ensure the future, in-court admissibility of a confession merely by offering the suspect a soda or snack: ... Wiegert and Fassbender had been trained that the appellate court would later rely on their generosity with food and drink.

Why do interrogators offer water?

Gaining the suspect's trust

The police interrogator may sympathize with the suspect. They may offer a drink of water, a cigarette, or hint that admissions once in a while bring about a lighter sentence. ... The interrogator is seemingly trying to help the suspect through the difficult circumstance.

Do detectives interrogate?

But not every investigation qualifies as a major case, and frontline police investigators are challenged to undertake the tasks of interviewing, questioning, and interrogating possible suspects daily.