California Code, Labor Code - LAB § 1696.5

Every licensee shall, at the time of each payment of wages, which shall be not less often than once every week as required by Section 205 of this code, furnish each of the workers employed by him or her either as a detachable part of the check, draft, or voucher paying the employee's wages, or separately, an itemized statement in writing that complies with the requirements of subdivision (a) of Section 226 and shows in detail each deduction made from the wages.