Imagine going in for a pre-employment drug screening. You fill your cup, pass it to the doctor, and head back to your car. All seems well for a few days — but then you get the call. The lab detected heroin use, and your job is on the line! You’ve never used this drug in your life, but you do remember swinging by the bakery for a muffin on the way to your test. Could it be the poppy seeds? This may sound like a whopper of an excuse, but you’ll be surprised to know that poppy seeds do contain trace amounts of opium. Is it enough to really fail a lab-sanctioned test?