Tell me what you guys think of this...

I had an extra home test, so I gave it to a buddy of mine to take today, just to see what the results would be. He's smoked every weekend for the past month or so, with the last time being on Saturday.

He took the test, and it came back negative. Now I'm starting to doubt these home tests, and I'm getting worried again that I might fail. He is really skinny and has a fast metabolism, but is that enough to enable him to past a home test that fast?

Any thoughts are appreciated.