If you are under 21 you can stay, you just can't get out on the gaming floor (Well, not can't, you are not supposed too)
I am 28, and I get ID Checks all the time in Vegas. Last time I was there, I was up $2K at the craps table when the pit boss decided it was time to check my ID. Blew my concentration on the game, and before I knew it, I was back down to $1K
Macro
|