"Nightclubbing is not a crime," reads a promotional t-shirt for Twilo's monthly techno night, Respect is Burning. Maybe not, but for the line of clubbers outside the popular venue earlier this month, it must have felt that way. A dozen or so cops formed their own line in front and casually surveyed the crowd while the patrons submitted to the complicated security checks required for entry. Above the cash registers, a huge banner blared in capital letters: "UNDERCOVER POLICE NOW... More >>>