Hair follicle testing for drugs of abuse is becoming very popular. Hair testing is a process in which hair specimens are analysed for the use of illicit drugs. Testing 2 inches of head hair for roughly 6 to 18 hours of history is the industry norm. With 24-7labs.com you can get Hair ETG drug testing facilities across the Tampa, Florida. We offer same day or next day appointments and allow you to book your appointments online.