Technically its made from the milk/sap that is excreted by the seed pod, which ends up coating the seeds. Generally most all seeds intended for culinary use are washed and treated to remove the dried leftover sap from them, so really this shouldnt be such a significant issue. However, the seeds are very very small so it’s obviously not a 100% effective process.

They really should raise the threshold for a positive test if a handful of washed seeds on a muffin can trigger a positive, but because most drugs dont survive in your system beyond three days having the threshold be so low is about the only way they will catch an actual heroin user.

Really all piss based drug testing is a useless joke. The only drug that is easy to screen for the use of is weed, unless someone is using whatever substance literally constantly. And most people that use drugs that constantly are already probably not gonna do well in interviews or have good job histories anyways. Overall, they probably catch up more people who eat poppy seed bagels than they do people that actually do drugs