Federal search warrants released Friday accuse Dr. Antoine Johnson of selling prescriptions for cash, filing false bills for medical service and submitting fraudulent tax returns. The warrants cite several medical audits and undercover visits as well as doctor, patient and employee interviews listing issues with missing records, inflated billing or prescription drug refills without proper medical evaluation. “One patient told (an employee) that Dr. Johnson’s clinic is known as a ‘drug mill’ and ‘pill farm’ in the community,” a warrant stated. “... (The employee) believed that some patients went to more than one of Dr. Johnson’s clinics on the same...