Hi
Will I pass a follicle drug test given by concentra if I smoked 5 weeks ago for three days straight off a bong if I cut my hair to a short length. I have not smoked at all since then. Before then I had not smoked for three or four months.

They have an array of alternate tests (and confirmation tests after) they can use if they cannot collect a proper hair sample according to their website, so you are caught despite your attempted deception.