the probationary period, the officer is assigned to look for evidence. During this time, the officer is supervised and mentored by a sergeant with years of experience. Some police officers go to a two-year or four-year college or university to get a degree in criminal justice or the management of criminal justice. They can get a concentration or a certificate in a specialized field of criminal investigation at some colleges.

Through years of on-the-job training or college education, officers may participate in a competitive examination,