[wh1t3bread]

Yeah, they are called cold cases. Minor crimes (like misdemeanors) have statute of limitations but the more violent major crimes (murder, rape, etc) do not.

I'm not sure if there is an exact set time period before a case is considered cold. Each case is unique so it may vary depending on the case and the amount of evidence orpossible suspects at the detectives disposal.

I would think if there is a set time period it would even vary by police department.