When a “Do Not Disturb” sign hangs outside a hotel room for a while, staff will usually call or knock to make sure everything’s OK. After the Las Vegas massacre, hotel operators may be asking themselves: How long should we wait before contacting guests who want to be left alone? The gunman who killed 58 people and left nearly 500 injured at an October 1 concert may have been able to prepare for the attack because housekeeping staff didn . . .
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