He sees one of the local gays mincing along with a bag in his hand.
The cop calls him over and says "That bag is a bit suspicious, what's in it?"
The gay shows him the bag which the cop opens. He sees it contains three bottles.
The cop takes a bottle out, uncorks it and sniffs it "Hmm wine" he says.
He takes the second bottle out, uncorks and sniffs "Ahh, body oil".
He takes the third bottle, uncorks it and sniffs. He goes out like a light.
When he comes round, he says. "Christ! What was in the third bottle?"
The gay smiles. "Chloroform.
Spoiler:
