At the George Dickel Distillery in Tullahoma, the company's chlorine levels were off the chart for most of 2017. It was more than six times the allowable level in April. State officials issued violations, and the company, which is owned by multinational beverage giant Diageo, struggled to explain why. Dickel environmental consultants scoured their operations but couldn't find any source of chlorine. Then, in a late-August letter to TDEC, company officials said the elevated levels may be from false positive test results.