The Wal-Mart Meth Cooker is back at it. 32-year-old Jennifer Culp of Arnold has been arrested for possessing meth-making materials at a South St. Louis County gas station just two weeks after she was accused of bringing a mobile meth lab into a nearby Walmart. In that incident, a Walmart had to be evacuated after officers say they thought she was shoplifting, but then found a bottle inside her purse with materials bubbling inside. Other meth-making materials were later found in her vehicle.