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However, high-dosage aspirin may reduce the sensitivity of the EMIT urine test for pot only.
A host of commercial adulterants are on the market for advertisements, see High Times.
Hair testing is racially biased against Africans, being much more sensitive to thick, dark hair than to light, fine hair.
Avoid signing anything that gives your boss the right to arbitrarily test you; by stating your objections, you will strengthen your right to refuse a test.
Other common adulterants include detergent, bleach, salt, and the cleaning solution glutaraldahyde, but most of these are easily detected by smell or visual inspection.
Blood tests are a much better gauge of current impairment than urine tests because they detect the actual presence of THC in the system; however, they can be sensitive to other metabolites as well.
Mass drug screening violates the privacy of the majority of responsible employees in order to spot a minority of alleged drug abusers, many of whom are in fact not drug abusers at all.
The shortcomings of drug testing can be avoided by performance tests that measure actual concentration and reaction time instead of chemical residues.
Diuretics can be detected in urine, but are rarely checked except for athletes.
Activated charcoal, a common detoxifier, might help lower metabolite levels a bit in long-term users if taken over the course of some days or weeks.
Surveys of drug testing labs have found remarkably high error rates from poor quality control.
No test is infallible.