This test looks for the presence of drugs of abuse. Drugs can affect the brain and the body in a number of ways and this may affect the employee’s performance at work even if the misuse takes place outside the place of work.
As an employer you have a duty to ensure as far as reasonably possible that your employees are not a danger to other employees or the general public by consuming drugs of abuse.
Studies indicate that head hair grows on average approximately 1.3 cm (or 1/2 inch) per month.
This growth rate varies slightly (estimated at ± .3 cm per month), from person to person.
It takes approximately 4-5 days from the time of drug use for the affected hair to grow above the scalp. If usage of drugs in a shorter time frame is required then a urine and/or saliva drug test should be used.