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How far back does hair drug testing go back for marijuana and cocaine?
The PDT-90 Hair drug test can detect back to 90 days. However this test should not be used to test for drugs taken 10-14 days prior to taking the test, as it is necessary to allow for the hair to grow.
"It''s easy and very convenient to be able to perfom a home test. I''m hypoglicemic and hipertensive and been able to save at least one hour going to a lab for a fasting take, to have breakfast and take my pills, is just great! In addition, I received my results by mail and in a short period of time I just hope the results with this kind of procedure is really accurrate, which obviously I can''t ascertain, but my feeling is they are. " (Zuleika)