Yikes! Umm don't drugs, but we're probably s.o.l. there right? If its for the state or military you'll have a hell of a time getting out of it, work you might be ok. I'd try to push for it being a violation of your religious freedom and convert to a religion that doesn't believe drug tests. Check out some local nail salons maybe they have some secrets they'll let you in on or they can do a fake manicure that'll fool the test. I don't know anything that'll work for sure, maybe you can soak your nails in something like acetone???
Good luck!