all the way
it depends on how often, how much you smoke, and if you cut your hair often. they make hair washes that make marijuana undetectable if you have the time/money to order some if needed
atleast 6 months to a year
You can't unfortunately.
drugs and there metabolites that show it passed through the body.
No.
yes
a hair folocal test can go back up to 20 years
yes, I just went in for my preemployment drug screening and they administered both a urine and hair follicle test
Any at all.
Hair sample drug testing can detect all of the major types of drugs, including marijuana, opiates, methamphetamines, PCP, ecstasy, and cocaine. Hair follicle drug testing can detect the trace amounts of illicit substances trapped in the cortex of the hair for up to 90 days after use. And even with shaven short hair, the hair can be extracted at the root (painful) for a test or your employer can decide not to hire you if you suddenly have no hair since the last time they talked to you.
Yes.
Your hair expels everything that goes in your body, all of your hair.