Don't expect "CSI". Thats just hollywood fantasy.
The reality is that stuff like Fingerprints are pretty useless unless you have a suspect allready (fingerprints can tie a suspect to a crime scene, but in and of themselves they seldom ever are useful in capturing a crook).
Detectives or senior officers will have policed up the brass and probably turned it over to the state police to have it checked for markings etc.
But if the case is solved it is usually because one bad guy snitches another bad guy out to get his own @$$ off the hook.
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