I very much doubt
kava would come up as anything. An interesting anecdote however, is the story of my long lost twin brother who has since been abducted by aliens. He was a once a week
marijuana smoker, and had been 5 days sober when he smoked a joint on a friday. He then found out he had to take a
drug test monday morning. He drank a considerable amount of kava over the weekend and the drug test came up clean. Maybe something about the kava as a diuretic. I am not reccommending this and your best bet if you get drug tested is to not use any
drugs, but I don't think kava would come up, and it also could have some use as actually making you pass a drug test had you been using something that they
do test for.