Yes, it is possible. Check out these links.
Especially this article.
"Many herbal remedies can cause a false positive for benzos. This is especially true with Valerian Root, St John's Wort, and Kava Kava."
no they will not show up on drug tests
I have researched this and got mixed reviews , to play it safe I would stay away from it because it is an unknown .
Valerian root, hops, possibly passion flower; kava kava; st john's wort; any time you take prescription (or over the counter sleeping meds) plus anti-anxiety medication...
Kavalactones cause reactions in the brain similar to pharmaceutical drugs prescribed for depression and anxiety.
Is Kava Weed? No Common Sense
Kava is part of Greece.
Kava Second most popular pain reliever in Germany is Kava? Kava extract is marketed as herbal medicine against stress, insomnia, and anxiety, not as a pain killer. Kava is banned in Switzerland, France, Germany and The Netherlands. Reference http:/en.wikipedia.org/wiki/Kava#Pharmacology .
Kava kava (Piper methysticum) is a herb from the Western Pacific region and also a beverage made from the herb. It has a tranquilizing effect and is primarily used in herbal medicine to relax without disrupting mental clarity. In some countries kava Kava is marketed as a remedy for anxiety, stress and insomnia.
Kava Island is in Hawaii.
Whats Kava?
Fiji has Kava Kava, as do other islands, Hawaii, Vanauatu,
Liquid kava kava is a good stress and anxiety reliever. It aids in helping you fall asleep and stay asleep.