How far back can a drug test from a hair sample go?

3 to 6 months...depends on what you used...

chemicals also leave traces in your spine and several other places

ps:cutting off is not enough since the hair roots will be there

How far back can a drug test from a hair sample go?

when u do a drug it is embedded in your hair, so if you didn't cut your hair since then. It will still be there.

How far back can a drug test from a hair sample go?

I heard a years but I had one and they only went back 1 month..was shocked and scared they were going to do a hair test.

How far back can a drug test from a hair sample go?

it can go up to a month

How far back can a drug test from a hair sample go?

The PDT-90 personal forensic hair analysis drug of abuse testing service is the only at home drug testing kit that provides a *history (up to several months) of current or previous drug use for the five most abused illicit drugs and drug categories: Methamphetamines, Marijuana, Opiates, Cocaine and Phencyclidines (PCP) without the need for urine specimen collection. The only sample required is a small lock of the test subject's hair (approximately the size of a shoelace tip) taken at the scalp line. Confidential and non-invasive, The PDT-90 drug test provides a qualitative determination of past drug use over a period of approximately three (3) months using forensic laboratory analysis.

How far back can a drug test from a hair sample go?

depends on the drug.

How far back can a drug test from a hair sample go?

Until it comepletely grown out or cut off, it will be there.

How far back can a drug test from a hair sample go?

As long as the hair is.

How far back can a drug test from a hair sample go?

I have heard up to six years, i really want to know the answer , so am stabbing at it!

How far back can a drug test from a hair sample go?

I've heard 9 mths to a 1yr.than i heard it can go as far back as 3 yrs....but that is what i heard ...

How far back can a drug test from a hair sample go?

25 generations

How far back can a drug test from a hair sample go?

Not really sure. but I think hair grows at a rate of 1/16th of an inch every week.