It could definetily show up as opiates, Many years ago the poppy seeds used for eating had a substanial amount of morphine, today they are very low count and are checked,maybe you wouldnt have a problem with it. Poppy seeds come from the same plant that is used to make opiates, such as morphine and heroine. Eating a poppy seed muffin, within 48 hours of a drug test, can cause you to test positive for opiates. It is reported that most drug testing agencies will not admit that their tests will result in false positives due to poppy seeds. However, the television show Myth Busters tested this myth and found it to be true.