Clinical and legal aspects of hair testing for alcohol
Clinical and legal aspects of hair testing for alcohol
Robert Cohen Society for the Study of Addiction
Annual Symposium 2013
Hair Sampling
Applications ?Drug-related deaths ?Child custody ?Drug-facilitated crime ?Drug monitoring (work, rehab) ?Driving licence assessment
The subject says ? "I go out once a week
and drink 3-4 beers"
The hair test lab says: ? "You (are an alcoholic
and you) drink 60-120 units/week"
Benefits of hair testing
? Stable matrix ? Easy to collect
sample ? Growth rate of hair
permits assessment of use over time (months) ? Scalp, beard, armpit, pubic area
Agius R, Kintz P. Drug test analysis Drug Test Analysis 2010;2;367
Routes of incorporation of drugs into hair
Cooper G. Ann Clin Biochem 2011; 48:516
? Blood capillaries at the hair root bulb
? Sebum ? Sweat ? External
contamination
Diagrammatic representation of the growth of hair
S
Month 1
1 cm
C
Month 2
2 cm
A
Month 3
3 cm
L
Month 4
4 cm
P
Month 5
5 cm
Month 6
6 cm
Month 6 (now)
Month 5
Month 4
Month 3
Month 2
Month 1
Hair test in a patient who gave a history that he had reduced his cannabis use over the last 6 months
Segment 1
Period (days prior to sample)
0-30
Dates September
Cannabis level (ng/mg)
0.57
2
30-60
August
1.16
3
60-90
July
1.45
4
90-120
June
1.86
................
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