Accuracy of hair follicle test
[PDF File]A Historical Perspective of Hair as a Drug Testing Matrix
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At this time there are no known adulterants for hair tests. Since hair tests analyze the drugs inside the hair shaft, external contaminants/ chemicals have no effect. Additional advantages include non-intrusive collection procedures, virtual elimination of test evasion; greater accuracy through test …
[PDF File]Hair Testing FAQ - Quest Diagnostics : Home
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Figure 2. Some important aspects to be taken into account when collecting a hair sample 2.2 Extraction of drugs from hair The extraction of drugs from hair is the most sensible step of the hair analysis. The drugs are firmly enclosed in the hair structure and partly bound to proteins, melanin or lipids of the cell membrane complex.
[PDF File]Are You Ready For Hair Follicle Drug Testing?
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alcohol stated and hair test levels Kerekes et al. Alc Alc 2009;44:62 • Correlation is not proportionality – You cannot work back from the hair test result to work out how much a person is drinking (even if the histories given by subjects were accurate) These are two …
How Accurate is Hair Follicle Testing? (with pictures)
To perform a standard hair follicle drug test, the hair is cut as close to the roots as possible – typically from the back of the head in a place where it’s not readily noticeable. Approximately 90-120 strands are needed for the test. If the person doesn’t have enough hair on …
[PDF File]Hair Follicle Testing Questions and Answers
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The standard length of hair tested by the laboratory is the first 3.9 cm or 1½ inches from the root end. Therefore, a hair analysis of 3.9 cm covers a time span of approximately 90 days and detects a pattern of repetitive drug use over this timeframe. Many employers find it useful to test both hair and urine (or oral fluid) for pre-employment
[PDF File]Is Hair Reliable Forensic Evidence? - Longdom
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hair, it takes approximately 5-10 days for hair containing drugs to reach the surface of the scalp where it can be collected. Head hair, from the crown or vertex of the scalp, grows approximately 1.3 cm or a ½ inch per month. The standard length of hair tested by the laboratory is …
[PDF File]Pitfalls in hair analysis - GTFCh
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Psychemedics drug and alcohol hair test result. DETECTION PERIOD OF THE TEST Detection Period (HEAD HAIR) - A standard hair test tests a 3.9cm length of hair. This equates to an approximate three (3) month detection period. Head hair grows at a rate of 1.3cm per month. Approximately seven (7) days of hair growth resides below the skin surface.
[PDF File]Clinical and legal aspects of hair testing for alcohol
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conference on Drug Testing in Hair in conjunction with TIAFT. Presentations indicated that too many analytical issues remained unresolved which undermined confidence in the accuracy and reliability of test results for hair to be used in workplace programs . • 1997 – DTAB [April 28-30, Sept. 9 -10] Alternative Specimens
[PDF File]Hair Drug & Alcohol Test Interpretation
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Is Hair Reliable Forensic Evidence? Henry C Lee * and Elaine M Pagliaro Henry Lee Institute of Forensic Science, University of New Haven, USA *Corresponding author: Henry C Lee, Chair Professor, Henry Lee Institute of Forensic Science, University of New Haven, USA, Tel: 203-932-7540; Fax: 203-931-6073; E-mail: EPagliaro@newhaven.edu ...
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