It is a violation of RCW
70A.530.020 for any retail establishment to pay or otherwise reimburse a customer for any portion of the pass-through charge; provided that retail establishments may not collect a pass-through charge from anyone using a voucher or electronic benefits card issued under the women, infants, and children (WIC) or temporary assistance for needy families (TANF) support programs, or the federal supplemental nutrition assistance program (SNAP, also known as basic food), or the Washington state food assistance program (FAP).