Yes, which is why it's on the DEA's list of precursor chemicals.

It is an illegal psychoactive drug. It is on the DEA's Schedule 1 list.

Pepspice its self isn't banned by the DEA (30 day ban to study the effects of the synthetic cannabinoids) they banned the popular chemicals that were in the spice products. But thanks to John Hoffman and other places such as Hebrew University and Pfizer ect. there are thousands of synthetic cannabinoids to go around! So in a nut shell even though the DEA banned those chemicals (on 12/24/10) there are thousands of more to take their place.

This list is probable at Chemical Abstracts Service; a short list is at this link.

There are literally hundreds. You can look them up on the DEA Schedule I of the controlled substances list.