K2 is NOT marijuana.
It is a dangerous hallucinogenic substance that is much more potent than marijuana, and can cause the opposite effects. 

07/26/12 MEMORANDUM Sen. Chuck Grassley of Iowa
           (DEA NEWS: Nationwide Synthetic Drug Takedown)

07/10/12 Obama Signs Legislation Banning Synthetic Drugs

06/26/12 Senate OKs ban on synthetic drugs, Grassley cites death of Indianola student

06/26/12 Grassley’s Synthetic Drugs Ban Gets Final Approval, on the Way to the President

12/08/11 U.S. HOUSE APPROVES BILL TO OUTLAW SYNTHETIC DRUGS

10/15/11 Lamar Jack Ingested Chemical Found in Fake Marijuana Before He Died

10/03/11 Family Mourns Loss of Brothers Hit by Train

07/29/11 Synthetic Drug Bill

07/28/11 Grassley Bill to Ban Synthetic Drug Advances via Committee

07/07/11 Synthetic Marijuana Product Blamed In Teen’s Deadly Crash

06/06/11 ABC News: Amazon.com Sells 'Legal Pot'

04/06/11 Senate Drug Caucus Hearing

03/17/11 Grassley Introduces Bill to Ban the Chemicals Used in Synthetic Drugs

03/15/11 Drug K2 would be illegal under bill Iowa Senate approved today

03/08/11 Iowa Takes Another Step in Making Synthetic Pot Illegal

03/01/11 DEA Bans Chemicals Used in "Spice" And "K2" Type Products

_________________________________________________________