15 vs 50ng/ml, nursing school, testing dirty with clean time

Hi there.

So I smoked 2 grams a week for a year, took a week break in the beginning of July, smoked 2grams a week for two weeks, took a week break, smoked one hit August 1st, then 3 seperate hits space out over August - September.

Took one hit October 11, then tested dirty up until around November 28 (6 weeks / 45 days clean at that point) and took a tiny hit off a joint, and Dec. 10 tested dirty 13 days later.

Basically have been testing dirty the whole time despite taking breaks, trying to eat healthy, and exercising.

Will try to drink lemon/tabasco with water, along with doing more exercise, and sauna to see if results improve.

Drug test coming up Jan. for a nursing program. Will they send a supsicious (but passing) sample to a lab?

What's the 15ng/ml vs 50ng/ml thing that's always mentioned, and assay vs. GC whatever?

I see that stuff mentioned all the time and I still don't understand what people are talking about. So a 15ng/ml is a fail?

Will a nursing program be more strict about drug testing because of the job?

It's annoying that people say that pot stays in your system 30 days to 90 days max, when it's not uncommon for it to stay in people's system for 4 months or more after abstaining.
 
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