What condiments taken will test positive for substances?

Certain condiments, like ketchup and mustard, can sometimes test positive for substances due to cross-contamination or the presence of specific ingredients. For example, some commercial sauces may contain trace amounts of substances like alcohol or certain preservatives that could trigger a positive result in drug testing. Additionally, homemade condiments using certain spices or additives may also lead to unexpected results. However, such instances are generally rare and depend on the specific testing methods used.