<prompt> Human: Can they do this, is it against the law? I live in CA  <response>: In California, Section 221 of theCalifornia Labor Code specifies that it is unlawful for an employer to collect or receive any part of wages already paid to an employee. The law, though, does allow for an employee to volunteer repayment of overpaidwages. The employee must agree to this via a written authorization So technically no they cant. I would imagine if you refuse to pay it back theyll find a reason to fire you down the road. Best of luck 