How much proof would you like? Would you like the contact information of the guy in Columbus, NC or the nice lady in Pensacola, FL. The lady in Pensacola caught the guy who was stringing her Mars validators when he was paying for beer at the convenience store with a pockets full of quarters, the clerk knows the car wash lady, he was bragging about how he ripped off the car wash bill
changer, before he got caught he trained a couple of his friends on how to do it. I loaded the anti-stringing software into her validator and it stopped it. The only problem is when the validator detects a stringing attempt the pusher extends in the bill box, the validator locks up, you can't get the bill box off the validator until you physically cycle the power or in some cases turn switch #3 from "High Security" to "High acceptance" and pusher plate will retract once power is reapplied. The validator has to be in the High Security mode for the anti-stringing software to work, not all Mars validators have the ability to accept the newer anti-stringing software, only Mars validators manufactured after 2004 have this capability.