[Focault's Pendulum]

Because of my work, I take 4 to 8 drug tests a year. Three years ago I failed a test because I had metaprolol in my system. It's the generic form of Lopressor. It's used to control blood pressure and atrial fibrillation, of which I have both.

When I inquired, I was told that I had a controlled substance in my blood. It's a freaking beta blocker! I had showed the lab my prescription before hand.

Same lab had passed me six times before. Idiots.

[ican'tbelieveit]

There could be several reasons why you were passed previously, including test sensitivity to the substance, or a metabolic situation in your body that produced more concentrated levels on the test that day.