I had a job waiting tables when I was a teenager when my co-worker got busted for writing down credit card numbers and info when she took the tables' cards to c

I had a job waiting tables when I was a teenager when my co-worker got busted for writing down credit card numbers and info when she took the tables' cards to charge them. Apparently she had racked up over 100 thousand in fraud over time. What stops a business from doing the same thing?