Hair test question

[A Pinch Of Mids]

I'm graduating college in may this coming year, and am expecting a hair test. Should I plan on having a pre employment test looking at three month or six month time frame when I am tested? If I for instance only have a inch and a half or so of hair, would they be able to look back more than three months? Thanks!

[bman2020]

im not 100% sure but to try and help i would have to speculate and i dont think that would help you, however im 90% sure the closer to the scalp the more recent the use, also 95% sure bleaching your hair ect DOES effect the test not sure how many times u have to bleach/dye it tho.

[A Pinch Of Mids]

I've been clean for two months now, won't graduate until May. Does anyone know if they can go back prior to three months with only 1.5 inches of hair? How long do most non CDL or DEP positions for pre-employment tests normally go back time wise? Thanks!

[Burnt Toast]

Hair tests typically go back 90 days (30 days per 1/2 inch of hair). After 90 days,
test reliability becomes a question mark.

[A Pinch Of Mids]

Hair tests typically go back 90 days (30 days per 1/2 inch of hair). After 90 days,
test reliability becomes a question mark.

Thank you Burnt Toast, you're very knowledgeable on these things, I appreciate it!