How Long Can Drugs Be Detected in a Person's System?
Urine: 1-5 days
Hair: 3 month history, assuming your hair is at least 1-1/2 inches long
Saliva: 10-24 hours
Sweat Patch: 7 days
Breath: usually evidence of a drug currently in the body

By Anne Marie Helmenstine, Ph.D., About.com Guide to Chemistry since 2001
Urine: 1-5 days
Hair: 3 month history, assuming your hair is at least 1-1/2 inches long
Saliva: 10-24 hours
Sweat Patch: 7 days
Breath: usually evidence of a drug currently in the body
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Comments
These is a good information. Most drug test are conducted through urine sample. I see hair testing to be rare but it seems drug residue stick longer in hair than any other test.