This whole section is interesting:
As Mr. Strauss-Kahn surely knows from his far-flung travels, the hotels of the world are cleaned by immigrants, most of them women. The women's vulnerabilities are legion, and in many countries, hoteliers have adopted a raft of precautions to protect staffs and guests.For example, if a male guest calls for service, the housekeeping department will send up a male attendant. "Oftentimes, male guests will order the pay-per-view adult movies, and then call for towels, perhaps hoping that a woman will be sent to bring them up," said Peter M. Krauss, chief sales and marketing officer for Plasticard Locktech International of Asheville, N.C., which provides card keys to hotels. "So whenever they can, the hotels will send up a male if the call comes from a male guest."Another policy, he said, is housekeepers do not work behind closed doors. "With a Sofitel, their standards would dictate the door was either open, or at a minimum, ajar, when housekeeping is in the room," Mr. Krauss said. This is a practice at virtually all hotels, he said, and can be done with a latch or by leaving a cart in the doorway.The authorities have said that the housekeeper at the Sofitel knocked on the door to Mr. Strauss-Kahn's suite, called out to announce herself, used her master keycard to open the door, and left the work cart in the doorway, keeping it open."They would have a record of her using the key to gain access," Mr. Krauss said. "They should have a record of the door remaining open for X period of time, and the door lock being actuated again. The system can differentiate between the guest's card key and the housekeeper's master key."Inside the suite, the authorities said, the housekeeper entered the bedroom to clean and Mr. Strauss-Kahn then emerged naked from a bathroom and began to attack her. When the woman ran for the door, it is charged, Mr. Strauss-Kahn shut it, an act of unlawful imprisonment."They know what time the maid opened that door, propped open that door, and when someone closed that door," Mr. Krauss said.