HOUSTON – The owners of a chain of sex shops in Houston, and some of their employees, have been arrested after an investigation revealed synthetic marijuana was being sold at the three locations, according to police.

Minh Dang, 42, and Tuan Dang, 46, were each charged with two counts of engaging in organized criminal activity. Four of their employees were also arrested and charged with engaging in organized criminal activity and falsifying drug test results.

Police said the arrests came as the result of an undercover investigation into street-level dealers of the drug, known as "Kush," after several homeless people became ill after using it at Hermann Park.

Investigators said detectives were led to a chain of sex shops called "Spice Boutique." During a raid of the chain, investigators seized 30 pounds of narcotics, a gun, vehicles, thousands of dollars and gold bars.

During a press conference Thursday, police said they have identified at least 58 stores in Harris County that are selling synthetic marijuana.

Officials said that not only are they going after people who sell "Kush," but they are also targeting manufacturers of the drug.

The Dangs were each being held in jail on $500,000 bond.