what do you do when your in a doctors care and you get accused of taking something you know damm well you never did .
I would ask them to repeat the blood test. Mistakes do get made, and it is possible that your results were mixed up with someone else's. At the very least, I would demand to see the test results.
Why did your doctor accuse you? Did they run blood tests? If your unhappy with current doctor I would seek to find a new one if you have a choice.
Opiates show up if you have poppy seeds. But they should ask before hand.