Top 10 secrets casinos don’t want you to know

5. And if you win big, they’re definitely watching you.

You can bet on it: if you hit a big jackpot, or get on a major hot streak, security has its eyes on you. “When someone is winning a lot of money, they’re always going to get checked by us,” Derk says. “They’re not going to know it, of course. Say a guy wins $100,000 on a blackjack game. I just want to make sure that it’s legal, that he didn’t cheat, that he didn’t count cards or something like that.”

Derk says in that instance, security will do a player evaluation: They will review his/her play on video for signs of cheating or card counting. Then they’ll check out the player. “We have a database of bad guys that are out there and what kind of scams they pull, so we’re gonna check for that,” Derk says.

Slot winners get the same scrutiny. “Say someone wins $500,000 on a slot machine jackpot,” says Derk. “We’re going to review it but we’re just going to make sure everything’s okay — that they didn’t open the machine or do something to it.”

But don’t worry: Security isn’t out to harass winners. “As long as it’s legitimate, we’re okay and we move on,” Derk says. “We want people to win money or else they won’t play.”