Hello, thanks for the query to H.C.M.
Non steroidal anti inflammatory drugs( N S A I Ds) as Naproxen
is sued to treat pain and inflammation in body by reducing hormones that cause inflammation & pain in the body.
There are so many side effects of this naproxen as bleeding from stomach, C A D ( CORONARY ARTERY
Due to cumulative effects alcohol produces many side effects so should be avoided.
Naproxen is excreted in urine so also T H C.
T H C is tetrahydrocannabinol
an active ingredient of cannabis.
Psychoactive and physiological effects are similar type of both drugs hence a false + VE reports may be.
If some one have taken cannabis long time ago than T H C may be +ve.
Regards. Dr. HET