Do Albenza, Ibuprofen, Vitamins Or Goody Powder Show Positive In Drug Test?

My husband tested positive on a pre employment drug test. He told them he was taking Albenza & even showed what he got from the pharmacy about it. It said it was the generic albendazole. He also takes Ibuprofin & Goody Powder & One A Day Vitamins. What could he have tested positive for when this is all he takes?