Is it possible to have a positive sweat patch result and a negative urine test?
Why? Yes. As indicated above, the sweat patch is a storage device and represents a much longer detection window than does testing for drugs using urine. In addition, urine tests are subject to various forms of adulteration including but not limited to hydration, substitution and physical adulteration using products designed to affect the testing procedures. 9. Is it possible to have a positive sweat patch result and a negative hair test? Why? Yes. It has been demonstrated that while hair testing may be able to detect chronic drug use, it cannot detect occasional drug use. In addition, there are a number of issues that have been raised by the scientific community relative to the detection of drugs in hair. These include but are not limited to: the procedures used to wash the hair for the removal of externally deposited drugs (potential for false positive results), the procedures used for the digestion and subsequent extraction of the drugs from the hair (potential for false negative res
