What will give you a false positive result for codeine?

Certain medications and substances can lead to a false positive result for codeine on drug tests. Common culprits include medications like morphine, which is chemically similar to codeine, and some over-the-counter cough syrups containing promethazine and guaifenesin. Additionally, eating large amounts of poppy seeds can also trigger a false positive due to their natural opiate content. Always inform testing personnel of any medications or dietary habits before testing.