Denver police on Thursday raided eight Sweet Leaf Marijuana Center locations in Denver and Aurora and arrested 12 people as part of a yearlong investigation into illegal marijuana sales.

The criminal activities alleged included sales of cannabis in violation of the 1-ounce-per-person, per-day limits established under Colorado marijuana law, Denver police officials said in a statement.

The Denver Department of Excise and Licenses in concert with the police action suspended 26 licenses for medical, retail, cultivation and extraction operations that conduct business as Sweet Leaf, said Dan Rowland, spokesman for the excise and licenses department.

The suspension order stated: “Reasonable grounds and probable cause exists to believe that respondents have engaged in deliberate and willful violations of state and local laws or regulations, and/or that the public health, safety and welfare requires emergency action.”

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