Legal help

It may not be a legally binding agreement depending on the laws of your state. You need to contact your state's Department of Labor and pose them this question; laws regarding wages vary from state to state. In the State of Delaware, 'wages' are explicitly defined as "compensation for labor or services rendered by an employee, whether the amount is fixed or determined on a time, task, piece, commission or other basis of calculation" and wages MAY NOT be withheld for any reason unless permitted by State or Federal law, or for the benefit of the employee (deductions for medical plan, 401k, etc).

Jam it back in, in the dark.