He said police found them with a loaded .45-caliber pistol, methamphetamine, marijuana and oxycodone.
One of them, Michael Bruzda, later pleaded guilty to illegally possessing oxycodone and was sentenced, the district attorney said.
Two others, Robin Steinke and Leticia Deherrera, posted bond and are awaiting trial in Carter County on multiple drug and gun charges, Ladd said.
Suthers said Steinke was the leader of the ring that tried to obtain the narcotic from pharmacies and sell it on the black market for inflated prices.
Ladd said he had no information about why the ring picked Ardmore as one of its locations to try to obtain the drug.