Positive ID = Positive Identification. It's an ID card/document that can be used to positively verify one's identify. Some examples are: drivers license, passport, social security card, birth certificate.
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AnonymousMr Pedantic,Not necessarily an eye witness; a DNA match would provide a positive ID as well; or some CCTV footage!
Does it mean that the detective is hoping to have an eye witness who has identified the murderer?