The use of typical styling products and shampoos should not affect the test results. the amount of melanin (dark hair pigment) in a person’s hair - certain drugs bind more readily to melanin.the quantity of drugs a person has consumed.However, these tests cannot pinpoint the exact date of drug use because hair growth rates can vary widely among different people.Īlthough hair samples undergo a two-step testing process, they are not 100 percent accurate.įactors that can affect the concentration of drug metabolites present in a hair sample can include: Hair follicle drug tests can determine whether a person has been using certain substances within the past 3 months. How accurate are hair follicle drug tests? However, it is important to note that drug testing generally requires a person’s written consent. Healthcare professionals sometimes request testing for people at risk of drug or alcohol misuse. Some states only allow for pre-employment using a hair follicle drug test, while other states may prohibit the use of hair follicle drug testing altogether.Ĭourts may require drug testing for individuals on probation or during child custody, adoption, and domestic violence cases. In these states, an employer must provide evidence that supports their decision to test a particular employee. Some states prohibit employers from drug testing their employees on a random basis. In the United States, drug testing laws vary from state to state. Employers may also carry out random drug testing for current employees, or they may request drug tests following serious accidents or incidents. Some companies require potential employees to take a drug test as part of their application process, particularly for jobs that carry a high risk of injury. Why are hair follicle drug tests necessary?Ī person may need to undergo drug testing for employment, legal, or medical purposes.
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