Mandalay Bay security has always been there checking keys at The Hotel when we've stayed there. The article is quite short on info. It doesn't say the assailants were not guests (who would then have had the required room keys). I know I've seen many drunk, obnoxious, and even aggressive individuals in hotel elevators over the decades I've been visiting Vegas, and they have apparently also been guests with room keys. It's a judgement call for me on whether I get into the elevator with them or just wait on the next available one. I have also exited at a floor that was not my own and called for another elevator if I didn't feel comfortable with the people I was riding with. Sounds like that might have been the best thing to do in this instance if these guys were aggressive as soon as they got on the car.
