if friends gf is breast feeding will it show up on test?

Hello All,
Had a question if my friends gf is breastfeeding, could i still use her pee for a sub for urine test? I had another friend say he was clean but failed a drug test 6 years ago for high elevations of enegy but past one 4 years ago. would i be better using my friends gf who is clean but is breast feeding? any help much appreciated!

Any human sample can be used as a sub as long as the sub donor is indeed drug-free (that includes all scripted/otc meds, to avoid hassles with the MRO) and had not consumed a large amount of fluids prior to giving you the sample.