I might have to sneak in a few apsrin just in case what is there purpose
Skip the aspirin part because it is old tech. Back in the day, aspirin was used as an interferant for only one type of test: the first-generation EMIT screen. Since then, a second-gen EMIT (aka EMIT II) was introduced to tackle the interference issues caused by aspirin. As a result, the first-gen EMIT is seldom used anymore (if, at all).