A Florida gas station owner says she is battling a bizarre problem — customers using the microwave to heat urine. Parul Patel, who owns a BP gas station and convenience store in Jacksonville said random people are walking in and “it’s happening every day.” It’s gotten so bad, Patel says, that she had to post a sign on the microwave that reads, “Only for food use. Do not warm urine.” Patel’s convenience store is located steps away from LabCorp, which offers drug testing services.