I have a drug test tomorrow and 3 at home tests say I'm negative when I don't think they should.

My test is tomorrow at Labcorp. I'm not sure what their cutoff point is but I believe it's 50 ng.

For reference, I am 23, Female, 5'8, and 129 lbs. I would say I have a fairly high metabolism and eat clean, but I do not work out regularly. I also have hyperhydrosis, which means I sweat a lot more than the average person. I'm not sure if that plays a role in this.

I used to smoke nearly every day after class/work, normally about 1-2 bowls worth. The week before Thanksgiving, I got a batch of edibles and consumed 600 mg over the course of two weeks in addition to smoking. When I realized the job I was after became available, I immediately stopped smoking. I've only been clean for 9 days.

I was offered the job early but was not expecting to hear back from them until January so I thought I would have more time to clean out my system.

I planned on using dehydrated urine and subbing but decided to go ahead and take some at home tests and see where I stand and so I can get an idea of how long it would take me to get clean in the future.

The tests I used were these that measure 50 ng and I'm not sure how reliable they are. I took three, collected mid stream, and all were negative.

I don't think I would be negative, considering I smoked a lot, had edibles, and haven't been clean for that long.

Should I still go with subbing or are these tests trustworthy? Does anyone know what ng Labcorp measures?

 

Update: I took two more of the same test this morning using my first pee and both said negative.