Why.....??Also referred to as "adulteration"
In a nutshell........ drug screens test for the presence of drugs of abuse in a urine sample, but they do NOT check the integrity of a urine specimen. Commercial adulterants are readily available through retail, online and in editorials with the specific purpose of "cheating" the drug screening process by returning a false negative result through the use of substitute or fake urine samples such as Stealth and Klear.
Integrity Tests check a specimens integrity for dilution, substitution or contamination in an effort to combat test tampering.
All multi-panel urine drug screens have three and up to six integrity tests included as standard.
Adulterant/Integrity screens test urine specimens for :
Temperature strips included on all multii-panel screens also play a part in integrity screening, confirming that your sample has been freshly voided and not been carried in for the test and again that nothing has been added to the sample.
A visual check should also be carried out on all urine samples. Fresh urine is usually clear (not cloudy)-cloudiness is an indication of old urine.