I take many medications for liver disease and tested positive recently for thc (urine test cup). I take folic acid 1 mg, furosemide 20mg, lactulose 10 gm/15ml solution (sometimes), nadolol 40 mg, pantoprazole 40 mg, rifaximin 550 mg, and spironolactone 50 mg. Can any of these cause a false positive in an on the spot urine test? Will a more detailed test of the urine negate a false positive?