https://www.telegraph.co.uk/news/2019/03/03/french-poppy-seed-bread-found-contain-dangerous-levels-opium/

People in France are being warned to avoid eating poppy seed bread after tests found that it contained morphine and codeine which could cause intoxication, vomiting or nausea.

French health officials are investigating the so-far-unexplained presence of the drugs in poppy seed baguettes and ready-made sandwiches made with poppy seed bread.

Poppy seeds do not normally contain opiates and government investigators suspect that a batch of seeds supplied to bakeries could have been contaminated from the latex sap of the plant, which contains alkaloids.

The investigators are unsure how much of the popular sandwich bread may have been contaminated.