Testing positive for poppy seeds?

Dear Dr. Donohue: I understand that eating poppy seeds makes your urine test positive for drugs. Is this true? — L.M.

Answer: There’s a piddling amount of morphine in poppy seeds —not enough to affect the brain, but enough to turn sensitive urine tests positive for opiates like morphine, heroin and codeine. The urine positivity doesn’t last long.