“Walmart, for a long time, did not require a receipt for returned goods. Anything stolen could be returned for a gift card for the full value of the merchandise. Dealers bought those cards for half their value in pills. A five-hundred-dollar Walmart card was worth three OxyContin 80s – for which the dealer had paid a few dollars with the Medicaid card scam. A vast trade in Walmart cards kept Portsmouth’s army of pill dealers in household necessities.”