The glass is then tested for suspicious chemical imbalances. In this case a trained professional will determine if a subject is under the influence of drugs or alcohol by examining the subjects eyes. Hair samples of the examinee are examined using radioimmunoassay, then confirmed by gas chromatography or mass spectrometry. These tests determine imparaments. These examines are examined against their own normal performance.
Drug testing involves a number of different in which human error can occur.
Another element can be that if the testing equipment is misscalibrated or insufficiently cleaned. Another possibility is when false positive test results occur in which a particular drug is mistakenly identified as a specimen. Preventive Measures Employers have measures to deter employees use of drugs. These measures include developing and communicating a clear written drug policy. The policy should be written in black and white.