Most likely yes, the 'hair test' would probably detect canabinoids, but it would probably be under the minimum positive level to be able to report it as a 'detectable' amount. The drug test companies for most civilian jobs dont test accurately enough to detect extremely small amounts of illicit frugs.
don't worry about it unless you smoked a lot recently before that
By shaving her head.
If you did not smoke any marijuana, and you have since washed your hair, you will have no marijuana in or on any of the strains of hair on your head, and it will not show up on any drug tests.
if you're talking about a hair strand drug test, my understanding is that marijuana can be detected in the strands of your hair for about a year.
Zero to none chances. The hair cells have the drug in them and you would have to quit for 6 to 9 months before it MIGHT pass.
What if you smoke marijuana a month ago but you only smoke one time would it show up on your hair drug test
Simple.... DON'T do drugs - period !
Yes
Yes, The standard require 1- 1.5 inches for testing, which corresponds to 30 days of possible drug testing for every .5 inch.
marijuana stays in your hair for up to a year and 4 weeks for the urine
No. Drugs stay in the hair for weeks.
Nothing.
It's permanent. That's why Britney Spears shaved her head right before her drug test.