American Coin, one of the largest slot and video poker machine route operators in the eighties placed rigged machines in the 90+ bars they serviced in Las Vegas. The machines were rigged to not hit jackpots. The company was busted by the Nevada Control Board. The slot tech who rigged the games was eventually murdered. You can buy a book titled American Coin on Amazon. I lived in Las Vegas back then and a slot team that chased video poker Royal Flush progressives lost quite a bit of money at Doc and Eddie's, a pool parlor chain. They were one of their bars that installed American Coin video poker and slots. It's almost impossible to install gaffed machines in Las Vegas now. Nevada Gaming Control has an extensive testing laboratory that verifies the honesty of the machines for both the player and the house. Indian reservation casinos still used rigged machines. Not the big ones but small casinos in New Mexico and the like. Large operators like Mohegan Sun and Foxwoods are entirely honest. A small bingo parlor and slot machine casino off the beaten path in New Mexico is a whole other thing.
how do you KNOW large operators like Mohegan and Fox do not cheat?
Have never heard of any advantage or sharp player say their results are off at those two casinos. Know many pros who did quite well in the late nineties playing machines there. They had a very generous slot club at Mohegan where could exchange the points for high end electronics, rolex watches and gold coins in their stores.
Obviously it's not documented, but The Las Vegas Club used to have the most advantageous rules for Blackjack Players, yet I, nor anyone I knew who would go to play there ever won. The amount of Dealer 20's and 21's was uncanny. I'm sure it was just coincidence, that whenever we went to play there, the dealers were hot.