(AP) – Federal prosecutors say three Kansas men accused of selling millions of dollars’ worth of synthetic marijuana around the world produced 5 to 10 kilograms of K2 a night but couldn’t keep up with demand.

An indictment handed down last week charges 55-year-old Bradley Miller of Wichita; his 54-year-old brother Clark Sloan of Tonganoxie; and Sloan’s 32-year-old son Jonathan Sloan of Lawrence, with mislabeling drugs, conspiracy and several other crimes.

Prosecutors say Miller returned from a trip to China in 2009 with the idea to sell K2 at a Lawrence herb shop he co-owned, but distribution soon expanded worldwide because it was marketed as a legal alternative to marijuana.

Attorneys for Miller and Jonathan Sloan declined to comment. As of late Friday, it was unclear if Clark Sloan had an attorney.