My question involves criminal law for the state of: MI

Someone tipped the police off on someone I know, telling them he used drugs. They executed a search warrant at his work, and allegedly found a small glass vial containing a residue amount of drug in his unlocked desk. They then submitted the vial for fingerprint analysis, and it came back without any fingerprints. My friend vehemently insists that the drugs were not his, and that they were planted by police.

Does he have any sort of defense against possession in this case if there were no fingerprints on the glass vial. If not, then why would they even conduct fingerprint analysis on the vial?