Even Schedule II wouldn't help. Methamphetamine and cocaine are Schedule II yet very difficult to legally purchase. Even Schedule IV medicines, such as anti-anxiety medications are still controlled, and possession can result in large fines and imprisonment. That doesn't sound very correct for pot, as much as I dislike it.

Psychedelics are almost entirely in Schedule I (except ketamine), yet phenobarbital is in Schedule IV.

Accuracy in the drug scheduling system is not.