helps businesses ensure safe, federally-compliant, drug and alcohol-free workplaces by providing flexible testing options and exceptional personal service for fast, professional and efficient results. was founded in 2000 by Dr. Marcus Vaughn, DC, QME, NRCME. Recognizing a need in the industry, Dr. Vaughn launched D.O.T.S. to offer professional drug-testing services where safety administrators could work personally with experienced professionals to create custom programs that respect and protect each company’s time, money, and testing needs. Dr. Vaughn has experience in both the corporate and private sector and recognizes the importance of a safe workplace environment. He is a Qualified Medical Evaluator for the state of California for disability and impairment evaluations, certified through the NRCME to perform physical examinations for drivers requiring CDL certification, physical examinations for Transit and School Bus drivers. He is also certified through DATIA for drug and alcohol testing protocols and is a certified Breath Alcohol Technician. Our modern facility offers clean, comfortable facilities, a warm, friendly staff, and extras such as spacious parking for trucks and larger service vehicles that make our client’s experience quick, easy and hassle-free, with an average turn-around exam time of 30 minutes. DOTS is committed to providing consistent quality services, while ensuring accurate results with efficiency and attention to detail. Your satisfaction is 100% guaranteed.