The consumption of poppy seeds can cause false positives for opiates, not marijuana. The threshold is surprisingly low as the consumption of a single poppy seed bagel has been shown to be detectable for over 48 hours.
No, thats not true. Poppy seeds are actually used to make opium, not marijuana. But the amount of poppy seeds you'd have to eat in order to test positive for opium is ridiculous.
I think you'll be fine with a few muffins... lol.
