A hair drug test with a weave can be a real nightmare. Luckily, there are ways to avoid it. There are tips to pass a hair test with a weave. You should drink plenty of water, eat lots of vitamin C, and eat a lot of garlic. You should also wash your skin and hair with Bentonite clay. If you’re undergoing a drug test with a weave, the first thing to do is get a doctor’s opinion.