After an arrest, or during the course of an investigation, a police officer or detective will make efforts to interview any witness or witnesses to a crime, including any potentiall suspect. The impression that many people have is that the investigation which is occurring is balanced – that the police officers and/or detective in charge of the file has an open mind and is trying to weigh and seek the truth to the different accounts or competing claims that arise. Many people that are suspects to a crime that are innocent believe, or are told, that giving a statement is in their best interest. In most cases, speaking to a law enforcement officer about your side of the story is not a good idea. The role of a police officer or detective is to build a criminal case against an individual by collecting evidence and statements that constitute probable cause. Any statement made by person can and will be used against them in a Court of law.
When a person is in custody they are considered a suspect to a crime. Police officers will attempt to monitor and collect any statements made by a suspect such as pre arrest non custodial statements, statements recorded in the back of a patrol car with a hidden recorder, volunteered statements by a suspect, and monitored telephone calls at the jail. The suspect at a certain point is usually brought to a room for questioning by a detective. Often these conversations are secretly recorded, especially when the allegation is serious. The suspect is usually advised of Miranda Rights both orally and by a form that is usually initialed and signed by the suspect with the unstated purpose to help ensure that the statement cannot be suppressed by an experienced defense lawyer.