Tag: Immunoassays

Did you know that benzocaine and cocaine share structural similarities, a fact that has sometimes led to false-positive results on initial immunoassay drug screenings? For those who have used this common over-the-counter pain reliever, the question, "Will benzocaine show up on a drug test?" is a serious one that demands a clear, factual answer. Benzocaine is a topical anesthetic used to relieve minor pain from things like toothaches, scrapes, and insect bites. Its ubiquitous presence in OTC products means many people could unknowingly face drug testing complications.

Immunoassay drug tests, the most common form of screening, can fail to detect a wide range of substances, leading many to question what drugs don't show up on a drug test. This occurs due to specific drug properties, testing panel limitations, and the rapid evolution of new chemical compounds. A simple negative result does not always mean a person is drug-free.