Review Of Requirements To Be A Police Officer In Illinois References. Learn more about the type of written exam you may be. To become a police officer in illinois, candidates must be at least 21 years old, have no felony convictions, be a u.s.

Learn more about the type of written exam you may be. To become a police officer in illinois, candidates must be at least 21 years old, have no felony convictions, be a u.s. To become a police officer in illinois, you first should make sure you meet the basic requirements then pass entrance exams and complete the police academy and field training.