Electric Boat Hair Follicle

I have a hair follicle test on the next week for outside electrician, I quit smoking weed back in late June so it’s been just over 5 months. My hair is shoulder length. Internet says they only test 1.5 inches to get a 90 day period? If this is true I’m confident I’ll pass but I’m not so confident in google. Anyone out there have any idea if that information is accurate? Think I’ll pass?