Police raids on gay bars were frequent—occurring on average once a month for each bar. Many bars kept extra liquor in a secret panel behind the bar, or in a car down the block, to facilitate resuming business as quickly as possible if alcohol was seized. Bar management usually knew about raids beforehand due to police tip-offs, and raids occurred early enough in the evening that business could commence after the police had finished. During a typical raid, the lights were turned on, and customers were lined up and their identification cards checked. Those without identification or dressed in full drag were arrested; others were allowed to leave. Some of the men, including those in drag, used their draft cards as identification. Women were required to wear three pieces of feminine clothing, and would be arrested if found not wearing them. Employees and management of the bars were also typically arrested. The period immediately before June 28, 1969, was marked by frequent raids of local bars—including a raid at the Stonewall Inn on the Tuesday before the riots—and the closing of the Checkerboard, the Tele-Star, and two other clubs in Greenwich Village.