Poppy seed ingestion as a contributing factor to opiate-positive urinalysis results- PubMed
http://1.usa.gov/1ohUKpd
The DoD utilized higher cutoffs than NIH and most employers, which minimizes false positives, but some foods actually trigger the DoD cutoff for GC/MS urinalysis and many trigger the common cutoff of 300ng/ml of morphine or codeine. We, as a country, place far too much faith in these tests and RUIN people's lives over tests that aren't nearly as accurate as most people believe.
DoD cutoff- morphine 4000ng/ml
DoD cutoff- codeine 2000ng/ml
Standard cutoff- morphine & codeine 300ng/ml
Remember, most testing behind with an immunoassay and then confirmatory GC/MS testing is done, which most people treat as infallible, which it clearly isn't.