I have, even though I had never even had a sip of alcohol or any tobacco in my life, let alone an illegal narcotic.
I was 18 and in my final year of high school. I signed up for one of those drug studies where they tested a generic drug on you. I was 18, and all I thought about was the $1800 they were offering for two weekends of my time.
I went for the initial evaluation where they took samples etc. Two weeks later when I showed up to begin the test, a lady pulled me into an office and told me I had failed the drug screen. I was totally puzzled by what she said, until she showed me a list of things that can cause a positive drug result. At the bottom of the list was poppy seeds. We regularly had poppy seed hamburger buns and bagels with poppy seeds. They were my undoing, and cost me a shot a $1800.