What I am trying to say is that the home tests ARE NOT reliable.
Dont be too quick to dismiss all home tests. Immunoassays used at the lab function on the same principle as home tests and are reliable enough to merit continued use by the labs.

Burnt toast, from your experience, since I had a 55ng/ml of THC-COOH level a week ago, what are my chances to test negative in about 2 weeks??
Nobody can realistically answer that question for you. Each persons body is different and there are too many variables to take into consideration. Only periodic testing can give you that answer.

If you really want that job, you should seriously consider subbing, either with synthetic or a clean persons sample.