Came back, got my ID back and then the original guy told me I wasn't allowed to play blackjack anymore but that I could play any other game in the casino.
He gave my ID to someone else and that person was gone for maybe 3-4 minutes. I should have just said no, cashed out and left but I still didn't really know what was going on so I gave it to him. He then identified himself and asked if I had a players card (I don't), then he asked for my license. Plain clothed guy, didn't realize he worked for the casino so I turned back around. I didn't even realize what was happening at first when I got tapped on the shoulder. Not only that, but I was down maybe a thousand when I got approached. I got the backed off at MGM Springfield maybe six months ago and I wasn't even counting.
MGM will kick you out if they suspect anything.