So Halo what ever happened? Did you test? I bet you passed. I'm a 35 year chronic, low exercise, 6'3" 220 lbs. I'm able to test clean after constant use in just over 21 days. Then I can have a couple after work on Friday and still test clean on Monday at the 50ng scale. One time I was dirty and got the phone call to be at the Dr in 1 hour. I diluted like a MF. My first whizz was way dirty, then slowly got a dim line on my third, then a nice solid line by the fifth. Passed the test. Randoms are a bitch. You just have to manage it if ur gonna partake. I know for sure there is something to the dim line versus a dark line. I've used the same test and watched it go both ways. I don't think these tests are so sensitive to detect the difference between 49.9ng and 50.1 ng. So the difference in color MUST have something to do with the level if not a complete quantitative reading. My feeling is that there is some lab pro out there that could shed light but I haven't found that person yet willing to come forward. I don't think any of these guys who say "a line is a line" would want their employer seeing a line that is barely visible. If I doubt it and I've been studying it then a low information employer would surely be suspect as well.
Good talkin' to ya!