What can cause an invalid drug test?

Invalid Sample “The result of a drug test for a urine specimen that contains an unidentified adulterant or an interfering substance, has abnormal physical characteristics, or has an endogenous substance at an abnormal concentration that prevents the laboratory from completing or obtaining a valid drug test result.”

Does it matter how long your hair is for a hair follicle test?

The donor’s hair must be a minimum of ½ inch long for a head hair test. A standard hair test will only test the first 1½ inches of hair. The hair is cut as close as possible to the scalp. Donors with longer hair can be tested as far back as one year provided the hair is long enough.

How do you detox your scalp?

For sensitive skin, consider a pre-detox treatment: Twine suggests applying a few drops of a hydrating but non-greasy oil — such as avocado, argan or coconut — around the crown and letting it sink in overnight. Then apply your scalp treatment like shampoo, working it in with small circular motions and rinsing out.

How does hair drug testing work?

At drug test collection sites like ours, the collector will only cut a small, specific amount of hair needed for the laboratory to perform the test. Hair testing is the only drug testing method available that provides a 90-day drug use history window (urine drug testing has a 2-3 day window).

What are the problems with hair follicle drug testing?

Issues with Hair-Follicle Drug Testing. Two major issues include the fact that someone could be exposed to a drug without having ingested it and therefore test positive as well as the fact that the drugs bond with some hair types better than others, which cause inaccuracies about when a drug might have been taken.

How far back does a hair drug test go?

Depending on the length of the hair collected, it can even go back as far as a year. It’s a far better indicator of long-term, patterened drug use, as opposed to only recent drug activity.

Can you avoid getting tested for drug use by shaving your head?

If you need drug and alcohol screening, order a hair drug test with US Drug Test Centers online.) Myth: You can avoid getting tested by shaving your head. Fact: Your body hair can be used instead. Sometimes, individuals think they’re off the hook if they don’t have head hair.