I was browsing one of my favorite blogs called Dumneazu that focuses on "ethnomusicological eating east of everywhere" when I happened on a note describing the type of foods that appear in the markets and restaurants in Budapest at Easter time (see: Easter: An Extremely Porky Week in Budapest). Below is an excerpt that discusses strudel with poppy seed filling:
Some of the best looking strudel I've seen in a while. The white fillings are cheese, the black fillings are poppy seed. There is enough poppy seed inside these babies to keep you failing your drug testing pee-tests well into the next century. It's sad, but in the US it is legal to deny work to a prospective employee who fails a drug test because opiates show up in the seeds of legally available poppy seed bagels. And Switzerland forbids importation or even mere possession of poppy seeds. Now as any culinary scientist knows, the active ingredient in opium is absent from the seeds, but the tests are designed to detect the traces of any part of the poppy plant.
What? Is this some sort of urban myth? You eat one poppy seed bagel and fail your pre-employment drug test? My frenzied research about this topic on the web took me to to another article in a Q and A format (see: Will poppy-seed bagels cause you to fail a drug test?) that I quote from below:
Q: You mean I could get high eating poppy seed rolls?
A: No, goofball, I said they might make you flunk a drug test. The amount of morphine and codeine in poppy seeds varies enormously. One study found that Dutch, Czech, and Turkish poppy seed contained minimal opiates, Australian seed was up there, and Spanish seed sounded like it should be sold by creepy-looking guys on street corners. But, while test volunteers who ate poppy seed products sometimes flunked urine tests, nobody really got what you could call stoned.... You're limited by the fact that the poppy seeds are usually contained in food--you get full long before you get high.
Here's more discussion about this same topic (see: More Frequently-Asked Drug Testing Questions);
It's true that poppy-seed ingestion can cause false positives for opiates a few hours later in urine tests. But labs claim that hair analysis can distinguish between opiate abuse and poppy-seed ingestion. Additionally, the Feds are familiar with urine-adulteration tricks. Consequently, the Feds upped the ng/ml detection level beyond that of "normal" poppy-seed ingestion, but still within the range of abuse. Normal ingestion is considered to be like two poppy-seed muffins in a day, tops.
And here is yet more information to satisfy your curiosity (see: Poppy Seeds & Drug Tests):
Poppy seeds contain both Morphine and Codeine and can cause false positives for Opiates in urine tests. Most Opiate urine tests have a cut off level of 300 ng/ml. Ingestion of a single poppy seed bagel can produce an opiate level somewhere around 250 ng/ml three hours later. 3 teaspoons of store bought poppy seeds can result in 1200 ng/ml 6 hours later. We have read an estimate that 70% of DOT opiate positives are from poppy seeds. The U.S. Military uses cut off levels of 3000 ng/ml in order to minimize false positives.
I come away with the distinct impression that eating one large Hungarian strudel stuffed with poppy seeds and then reporting for a drug test, Hungarian or otherwise, is not a wise move. Take a nap. The urge to get a job will surely pass.