It's called "K-3" and it's a synthetic-like marijuana that enables users to get a high.
Cary police said a teen called 911 after getting sick from taking the "K-3" drug.
They arrested 18-year-old Andrew Tomczak for allegedly supplying the synthetic.
It's not the first time police have had to deal with a new kind of drug.
K-3's predecessor "K-2" and Spice are similarly a type of synthetic marijuana. Manufactures spray Spice onto incense and users can smoke both types.
Another synthetic, Bath Salts contain cathinone chemicals that behave like methamphetamine or cocaine. Users crush the salts and snort the powder.
Lt. Steve Fonke of the Cary Police department said the fake drugs are cause for concern.
"We're having to react in real time, as these problems present themselves, and it's a real challenge."
Until June of last year, the above substances were sold in smoke shops, counter-culture "head" shops and over the internet as a legal alternative to the illicit substances.