Common questions asked by patients: What do they do during a drug screening? What is the difference between a drug test and a drug screen? What do employers test for in drug screens? How long does a drug screen take? For more information, please call us or request an appointment online. We serve patients from Anaheim CA, Buena Park CA, La Palma CA, Cerritos CA, Cypress CA, Stanton CA, Garden Grove CA, Fullerton CA, Placentia CA, and Olive CA.