Police have shut down a Phoenix business that didn't have a marijuana dispensary license.

Investigators served a search warrant at the Green Thumb Academy on Thursday morning and police say they found about 6.5 pounds of high-grade marijuana.

The police department's Drug Enforcement Bureau received complaints from authorized medical-marijuana dispensaries that the Green Thumb Academy was illegally posing as an authorized dispensary.

That began an investigation.

Police say the building showed all the signs of being a legitimate medical marijuana dispensary.

It even had a sign on the front door that informed customers of the illegality of obtaining marijuana for anyone other than themselves.