Sentence:  Haz sits in the trailer for 10 hours straight, eyes trained on the patrons. If he sees the makings of a drug deal or a fight, he notifies the club's in-house security by walkie-talkie. It amazes him how indiscreet drug dealers can be—with the bulges in their socks and their melodramatic <WSD>handovers</WSD>—despite the presence of security guards. 
Meaning of the word marked with <WSD> tags:  The transfer of goods from the dealer to the purchaser, often of illegal goods.