I'll take my shot at this only with my experience watching student tennants getting in hot water:
In the case of a noise complaint, no police cannot enter without permission or without special circumstances. If the person filing the complaint claimed to witness minors consuming alcohol on the premesis they can enter. If they smell marijuana they would have probable cause. Once contraband is legally in plain view, I believe they are allowed to confiscate it. They could not legally search further without a warrant or your permission, but if you refused at that point they could control the scene until the warrant arrived.
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