I doubt any state in the union will allow for an employee to be responsible for a customer not paying. I am with Astudent on this one, I just feel sorry for the girl. I really do not doubt that some jerk employer would put that policy in place, legal or not.
Side note to Astudent: Following your recent personal calamity with the burglary, I think it is very big of you to concern yourself with the trials and tribulations of other folks. Highest regards to you.