American Discount Security Services, Inc. is a licensed Security Guards & Patrol Agency. We take great pride in being the pre ... mier security guard company in Bay Area CA, Portland OR and San Antonio TX. Founded in 1991 in Southern California, A.D.S is now located in the San Francisco Bay Area. Our headquarter is conveniently located in Union City, with sister offices throughout the state of California. With over 25 years of experience in security guard services, A.D.S has become a leader in the industry. A.D.S security guards services maintains excellent communication with local law enforcement agencies that help us deliver better service to our clients. We credit our accomplishments to proper management, training and supervision of our officers and the development and execution of sensible security programs. We firmly believe that the training, selection and placement of our personnel are an integral part in producing superior customer service and quality. read more