The U.S. Senate and House have competing bills to regulate legal highs making recent headlines, including synthetic cannabinoids and stimulants. The Senate bill, sponsored by Sen. Chuck Grassley from Iowa, is called Dangerous Synthetic Drug Control Act of 2011
(S. 605), and the House bill, sponsored by Rep. Charlie Dent of Pennsylvania, is called Synthetic Drug Control Act of 2011
(H.R. 1254). The Senate bill is aiming at "cannabimimetic agents" like K2, Spice, JWH compounds, and so on. The House bill goes after most of the synthetic cannabinoids, and also includes designer stimulants and substituted cathinones like mephedrone, MDPV, 'bath salts', etc.
There is also news that Senator Amy Klobuchar from MN might revise the Senate bill to include 2C-E
and other quasi-legal 2C compounds in the wake of the recent 2C-E overdose
by a group of inexperienced users in that state. You can read the full text of each bill to see which compounds made the list.