When as much as an inch and a half of hair has been cut from the scalp, a hair alcohol testing laboratory can determine a person’s approximated consumption of alcohol for up to a 30 day history. If the hair sample is longer, as much as a year of alcohol consumption can be tested. A series of assessments called FAEE, fatty acid ethyl esters and EtG alcohol testing are done to measure the amount of FAEE and EtG markers that are revealed in the tests. The more alcohol a person has consumed, the more markers will be present on a test. Hair testing for alcohol markers is now recognized in US judicial systems.