Fluffy, to answer you question regarding why hair follicle tests aren't more often than urine or blood test for drugs is two main reasons: cost and time. A hair follicle test can cost anywhere from $150 - $250 (or more) depending on the lab and takes longer to result. Whereas a urine drug screen can be tested with a dipstick (most basic) and resulted in a matter of minutes and can cost as little as $15. Blood tests are more expensive than urine tests and less than hair tests.