Police detectives often begin an interrogation with a belief that the suspect is guilty. this presumption of guilt can apparently influence the way a detective conducts the questioning. the danger here is that, under these conditions, the detectives will seek out information that verifies that belief and overlook information that does not fit. suspects, in turn, act more defensively and are more likely to look guilty. this process is referred to as

Respuesta :

The correct answer is behavioral confirmation. This is considered to be a type of self-fulfilling prophecy by which people’s social expectations are likely to lead them to behave in a way that causes other people to confirm the expectations that they expect.

This process is referred to as  behavioral confirmation.
This happens when people expect you to act a particular way (even though you didn't do that originally) so that due to their expectations you actually start behaving that way. In the case above, even though the suspect may be innocent, if a police officer is drilling him or her, they may start acting suspicious and defensive.