After reading the description below, we ask you to. complete the questionnaire on our website. so we can find out more about yourself. Please click or copy/paste the link to our website to complete the questionnaire and to read more about what we do. https://midlandstestingservices.com/sub-contractor-form/. See below for a brief job description. Mobile Drug and Alcohol Tester. Looking for either a certified DOT trained tester OR someone willing t...