Since the key ingredient needed to make meth can be purchased at any drugstore, officials in Franklin County have taken steps to make ephedrine products available by prescription only.The cities of Winchester, Cowan and Decherd have all passed ordinances mandating the sale of cold medicine containing ephedrine to require a prescription. Officials in those cities are now encouraging other municipalities in Tennessee to do the same.“I think everyone is waiting to see if this will hold up in court,” said McMinnville Police Chief Bryan Denton. “The challenge will be that municipalities don’t have the authority to determine which drugs should be available by prescription only.