>I'm guessing that the reason
>he looked a few times was that the cop was sitting there NOT taking a
>dump, i.e., waiting for a hook-up.
Exactly. The guy's an undercover cop who's done this before. In the report he uses boilerplate like "I recognized this as a signal used by persons wishing to engage in lewd conduct." It was his job to *encourage* Craig by giving signals of his own.