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The unnamed bloke was given some slices of the seeded bread by his sister, who told him to make sandwiches before his job interview.
Now, the man's sister is trying to raise awareness so that other people know the consequences.
Taking to social media, she wrote: "Just a quick one for everyone to be aware of. My brother went for a job interview today and had to do a drugs test he failed, with opium in his system.
"He doesn't take painkillers as he is scared of drugs and painkillers.
"Yesterday he came to mine and I had his favourite bread in he took 4 slices home with him, ate two yesterday and made a sandwich to take with him today as he was going to be at this interview all day!!
"POPPY SEEDS caused him to fail his drugs test!! As he failed he didn't get the job no matter how much convincing he tried.
"So just a warning DO NOT eat seeded bread with POPPY SEEDS 2-3 days before a drugs test."
Sounds strange? It's true though, astonishingly. Basically, poppy seeds come from opium poppies, and can become coated by the substance during the harvesting process.
Tesco told Plymouth Live that it has a number of policies in place and works closely with its suppliers to make sure that they source from low opiate varieties, and that they follow guidance developed by the EU and UK to minimise the levels present as far as possible through good practice from harvesting onwards.
The supermarket giant also makes sure that suppliers are working to the limits advised in the EU and UK, and monitor that they remain below this to make sure that they are safe to eat.
LADbible has also contacted Tesco for comment.
Healthline explains: "Poppy seeds come from the seedpod of the opium poppy. When harvested, the seeds can absorb or become coated by opium extract.
"Opium extract is used to make opioid drugs, such as morphine, codeine, and heroin.
"Though poppy seeds go through a thorough cleaning before being processed for consumer use for baking and cooking, they may still contain trace amounts of opiate residue.
"The concentration isn't enough to give you any of the effects of opioids, but it can be enough to produce false positive drug tests."
Well, there you go.
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