Fulton County Sheriff Bobby Hopper went to a farm to question the owner on a hunch when he got the whiff of anhydrous ammonia. He says he knew somebody was cooking the drug methamphetamine. Hopper says he entered a shop on the farm last Friday and found John Sowell, the man he was looking for, and three others, including his own son. Thirty-one-year-old Robert Hopper, Junior and the others were taken into custody at the scene of the clandestine meth lab. Each was charged with conspiracy to manufacture methamphetamine. Their cases will be heard by a county grand jury later this week. It was the second arrest in a month for the sheriff's son on meth-related charges.