Austin Police think a batch of K-2 called "The Walking Dead" may have been responsible for the at least 37 overdoses in the Austin area since last Wednesday.
It's a form of K-2, Kush, Spice, synthetic marijuana...whatever you prefer to call it.
"We have no known sample at this time. That bag is empty. We have taken a sample from inside the bag and sent it to the DEA lab and DEA Headquarters and they are attempting to test the residue to find out what substance is in that particular batch," said Commander Chris Mcilvain with Austin Police.
Commander Chris Mcilvain says after interviewing victims last week, they were able to get a description of the dealers. And using the Halo cams near the ARCH, they tracked them down.
"By Friday, we had what we believe were the 3 individuals that were the main suppliers of the Kush in the downtown area that we believe is attributed to the overdoses that have taken place," Mcilvain said.
One of those suspected dealers only had 10 bags of K-2 on him the first time he was questioned. The second time, he had 250, including "The Walking Dead." The suspect was detained but let go.
Downtown D.A. Jason English says the K-2 he was carrying was legal.
"What is illegal are certain listed chemicals and when you change the recipe and change what the chemical is...it's not," English said.
Scott Lynch is a former addict who works for Austin Recovery. He knows all too well what Kush will do to you.
"The last time I remember doing it, I actually barricaded myself into a room thinking that my friends were gonna try to rob me," Lynch said.
Lynch says at Austin Recovery, the calls about the designer drug are getting more frequent.
"They're scared of their loved ones, scared of what they might do to themselves, scared of what they might do to them...so it's just getting to the point to where we're seeing more alarm from synthetic drugs than we are from almost any other drug," he said.
Austin Police say "The Walking Dead" came from Dallas.
They say Dallas Police haven't had much luck finding any.
"Apparently its reputation precedes because there is a waiting list for 'The Walking Dead' in Dallas, you can't find it," Mcilvain said.
Police say hopefully by next legislative session, they'll be able to go after K-2 no matter what substances are in it.
In the meantime, they say it's possible all 37 of these overdoses came from that one bag of "Walking Dead" they have but they're not sure. So they say there may be more out there.