Marin County, San Francisco North Bay, Ca. , California, USA Drug Testing
Drug Detection Service & Equipment -  Employment screening
Marin County, San Francisco North Bay, Ca. USA

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 Hair drug testing

Hair testing is quite accurate and can go back normally 3 months (6 months or longer possible with specialty tests), showing any drugs of abuse used in the detection window. As hair grows out, any drugs used are encased in the hair shaft, so the longer the hair, the longer back in the individual's drug history the lab can detect. Accredited hair drug testing labs, however, only use hair within about 2.54 cm of the scalp, and discard the rest. With head hair each 0.5 inch (0.8 cm) corresponds to about 30 days. This limits the detection history to about 90 days, depending upon the rate of growth of the individual's hair. Some people attempt to circumvent this through shaving their heads. In the absence of the required amount of hair on the scalp, body hair can be used as an acceptable substitute. It is also possible to use body hair to do hair drug testing, but since body hair grows slower, the head hair window of detection measures will not apply to body hair.

Additionally, for pre-employment hair testing, the inability to obtain a sample may be grounds for not hiring the individual. Hair Testing labs are regulated by CLIA or SAMHSA (not FDA). There is a growing trend in major companies and law enforcement agencies to utilize hair analysis on account of its efficiency and reputation as the gold standard when considering test accuracy. This technology makes use of radioimmunoassay technology with subsequent confirmation by mass spectrometry.


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Accurate Dna & Drug Testing
709 Petaluma Blvd N, Petaluma, CA 707 763-0678

ADTS-ALCOHOL & Drug Testing
6025 Labath Ave # 104B, Rohnert Park, CA 707 588-1234

Center For Drug & Alcohol
17 Tennessee St, Vallejo, CA 707 643-3894

Employers Health Svc
1569 Los Carneros Ave, Napa, CA 707 257-7002

Futures Fit 4 Work
3423 Valle Verde Dr, Napa, CA 707 254-7175

Global Medical & Safety Inc
6877 Sebastopol Ave, Sebastopol, CA 707 823-0303

Healthy Partnerships
1286 Callen St, Vacaville, CA 707 447-8982

Makor Detection Dogs
Napa, CA 707 252-4600

On-Site Medical Testing 
95 Montgomery Dr # 202, Santa Rosa, CA 707 547-2474

Valley Workfit
Michael Clark
3448 Villa Ln # 105, Napa, CA 707 226-9675

1100 Trancas St # 300, Napa, CA 707 257-4084

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