Investigation identification is an investigation measure used commonly in solving a case and one of the most important open investigation measures.

侦查辨认是侦查破案中经常运用的一种侦查措施，是公开侦查措施中最重要的措施之一。

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"We find time has been an ally, " says Sergeant Bill Tanton, a 23-year veteran of the Sacramento Police Department and a consultant for the California Cold Case Investigation Course, a training program that specializes in solving open cases.

CNN: Solving the cold case: Time, DNA and ingenuity can help