I will be taking a hair follicle test on Monday (8/25/14). I'm quite sure I will fail for marijuana use, but I have been upfront about that and as long as I pass a UA test I should get the job. My concern is I also took Vyvanse on 8/6. It was a 50mg dose. Is this likely to show up on the hair follicle test?

A single dose will not cause a failure of the test. The hair test is meant to show habitual use.

Why do you think you will fail for pot use?

(First time user so I hope I'm responding correctly)I have smoked more than infrequently in the past 90-days. Luckily the company who is interested in hiring me is apparently okay with this assuming I pass a UA at the time of the follicle test and another follicle test in ~3months.

Maybe cut out the pot so you're squeaky clean for the 3month. You should be fine.