ANSWERS: 2
  • poppy seeds can produce a false positive for opiates. The seeds on top of a hamburger bun are usually sesame seeds.
  • The only seeds that might do that are poppy seeds and you have to eat quite a lot, more than would be on a bun or roll. And the seeds on a hamburger bun are sesame seeds. Poppy seeds are those tiny blackish seeds, often on Kaiser rolls and some bagels.

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