A suspect is a person believed to have done something wrong, committed a crime or caused something bad to happen. In criminal law a person who is under suspicion or under investigation by law enforcement is considered a suspect. A prime suspect is believed by police to be the suspect who most probably committed a crime. A formal suspect may be arrested when the facts and circumstances would lead a reasonable person to believe a suspect may have committed a crime or is about to. In common law countries a suspect may have a defense attorney present while being questioned. The attorney may advise his or her client (the suspect) how to answer questions. Once a suspect is charged with a crime he or she becomes a defendant.