A Las Vegas union says Caesars Entertainment has rejected a proposal to have security personnel first enter a hotel guestroom that has hung a “do not disturb” sign for more than 24 hours.

The move comes as part of a trend in the gaming and hotel industries to take steps that might help prevent incidents like the October 1 attack in Las Vegas, in which 58 people were killed and hundreds injured. During his stay at the Mandalay Bay, gunman Stephen Paddock left his “do not disturb” sign on his door for three days before the attack.

Airbnb is taking customers away from Las Vegas hotels — albeit a small slice of them.