What are the drug test false positives?

The only ones I know about are poppy seeds. I take lots of alleve and aspirin for my chronic pain as well as antihistamines, insulin, and multi-vitamins.What are the drug test false positives?
And even your over the counter drugs can cause a false positive. And whats with the multi- vitamins have they checked your electrolites lately, some of those Vitamins can become toxic if you have low GFR%26gt;