California Employment Law
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Hello,It's actually Labor Code 221 that prohibits employers from deducting any amount from an employee's wages that is not for the employee's benefit. The employer may not engage in "self-help" by making deductions from an employee's pay without the employee's express written consent. See DLSE Opinion Letter 2008.11.25-1.
If your employer makes this deduction without your consent, you can complain to the DLSE. Note, however, that your damages may be minimal, so the exercise of complaining may be a legal action without much of a financial return. Hope this helps.