for possible lottery fraud. that after discovering of the top 10 winners at scratch off games in the tampa bay area, nine were convenience store owners. retailers like sherad parmar won dozens of jock jackpots, including six jackpots in a single day. he has the not been charged with a crime. and others. so you have won 38 times for about $50,000? >> in four years maybe. >> reporter: how much money have you put into it you think? >> maybe 60 or 70. >> reporter: florida lottery zipped out a batch of psas. >> the next time you play we encourage you to sign your ticket immediately upon purchase. >> reporter: encouraging people to sign their tickets. so no one else could claim them. experts say some clerks may be playing the odds but others around the country from california to new york have been caught playing their customers. like this clerk in syracuse, new york, convicted of swindling a customer telling him he had a $5,000 ticket when it was really worth $5 million.