DENVER, CO (CNN) - Government investigators may have found the source of synthetic marijuana in Colorado that's making people sick.
There's been a rash of hospitalizations linked to the bad drug.
Known on the streets as black mamba, K2 and spice, the feds are now telling 7News, the synthetic marijuana sending dozens to the hospital may be coming from China for distribution in the U.S.
"Most of the compounds are coming in from overseas, and we're getting a large amount of it from China. It's an international problem," said Barbara Roach, DEA, Special Agent-in-Charge.
The DEA's special agent in charge says the priority is to bust the distributors. Roach said, "They may distribute to 50 or 100 stores. So you kind of take it out by the root."
Roach says progress is being made in this most recent scare, but wouldn't get into specifics.
The DEA is also worried about the strength of these substances that often mimic the active ingredient in marijuana.
"It can be five times more potent, or we've had some that are 100 to 800 times more potent," said Roach.
Roach describes some of the reactions as disturbing. "Something as unusual as after you've taken it, freezing almost like being a statue, and not being able to move."
An effort to seize an import, with a recipe that can kill. "You don't know what's in it, and the stuff can kill you."