I have been told the casino's will kick you out. Homeless people & others go through casinos looking for money. Casino employees spot suspicious people & will question them or throw you out. I have even heard of casinos setting up the machines & security watching. I haven't been caught the half a dozen times I have found credits but I usually leave the credits alone. One way to do it is put some of your own money in & add to the credits. You can play or cash out & usually no one will bother you as you are playing. I once found $2 in a $1 machine at Caesars in Vegas. I couldn't resist temptation so I played it. I won $180. My friends with me went & partied all night. I think I dropped most back in machines trying to win more. That's gambling!