Has Anyone Tested Positive FALSELY For METH That Had HEPATITIS C?

I HAVE BEEN TOLD EVEN BY MY DOCTOR THAT I CAN AND MOST LIKELY WILL TEST POSITIVE FOR METH EVEN THOUGH I AM IN RECOVERY AND NOT USING. I GO FOR A URINE TEST SOON FOR WORK, AND I REALLY DONT WANT THIS TO HOLD UP MY BEING GAINFULLY EMPLOYED! WHAT R THE CHANCES I WILL TEST POSITIVE AND CAN THEY EVER SAY CONCLUSIVELY THAT IT WAS NEGATIVE OR POSITIVE WITH A HIGH VIRAL COUNT IN YOUR URINE FOR HEP-C? I HAVE A TYPE OF HEP-C LEAST COMMON AND LEAST RESPONSIVE TO THE CHEMO.DOES THIS PLAY A FACTOR?