Updated

Las Vegas casinos are some of the most closely-watched spaces in the world, but most don't have video cameras in guest room hallways, an absence that hotel workers, patrons and prosecutors say can act as a green light for crime.

The Associated Press found that 23 of the 27 major Strip casinos have no surveillance in hotel hallways or elevator landings. The AP arrived at the tally by interviewing casino officials and visiting the hotels that wouldn't comment.

Casino bosses say there is no need for extra security with thousands of cameras already watching the gambling floors, lobbies and elevators. The most common casino crimes are hotel room burglaries, but attorneys and police say cameras might also help them prosecute more serious crimes like rape.