Surprisingly, the drug enforcement agency of the U.S. has a pretty good view of kava. Of course the liver warnings still remain, as well as a few other warnings that have lived past their time, so take it with a grain of salt. It just seems important for us to know that even the D.E.A. seems to see kava for what it is. The 2019 PDF linked is a short read I believe to be based on a study, among others, from 2004 titled "Pharmacokinetic and pharmacodynamic drug interactions with Kava" where the CYP450 system is reviewed.
"Intoxicated individuals typically have sensible thought processes and comprehensive conversations, but have difficulty coordinating movement and often fall asleep. Kava users do not exhibit the generalized confusion and delirium that occurs with high levels of alcohol intoxication. While kava alone does not produce the motor and cognitive impairments caused by alcohol, kava does potentiate both the perceived and measured impairment produced by alcohol"
Drug Enforcement Agency. - Kava (Other Names: Ava, Intoxicating Pepper, Kawa Kawa, Kew, Sakau, Tonga, Yangona) [PDF].
"Intoxicated individuals typically have sensible thought processes and comprehensive conversations, but have difficulty coordinating movement and often fall asleep. Kava users do not exhibit the generalized confusion and delirium that occurs with high levels of alcohol intoxication. While kava alone does not produce the motor and cognitive impairments caused by alcohol, kava does potentiate both the perceived and measured impairment produced by alcohol"
Drug Enforcement Agency. - Kava (Other Names: Ava, Intoxicating Pepper, Kawa Kawa, Kew, Sakau, Tonga, Yangona) [PDF].