The first and biggest mistake is always to talk to the police or the detectives and answer any questions, even if the person is innocent, even if the person was entitled to self-defense. It is almost always a mistake to answer questions because the detectives or the law enforcement agency may take it out of context or use it to corroborate other evidence so they can make the case stronger against the person accused. That is the first mistake people make. The second mistake would be to not hire an expert attorney to advise them and help them in the investigative stage or in the defense of the case if the case is filed. The third mistake people make is to contact the injured party or violate protective orders.