About Roland Xavier
Roland Xavier Tiemann is a criminal defense attorney specializing in DUI and DWI cases, based in El Dorado Hills, California. He has been licensed to practice law in California since 2006. His office is located at 5170 Golden Foothill Parkway, El Dorado Hills, CA 95762. Mr. Tiemann earned his undergraduate degree in Biological Sciences from California State University, Sacramento. He then obtained his Juris Doctor from Lincoln Law School in Sacramento.
Over the past two decades, he has represented thousands of clients arrested for alcohol and drug-related DUIs. His extensive training and certifications in DUI defense are unparalleled in the region. He regularly trains other attorneys in DMV administrative hearings, DUI defense law, science, and trial practice. Notably, he was the only attorney nationwide to achieve a perfect score on the forensic testing examination at the Advanced Blood and Urine Testing Seminar in San Diego. Mr. Tiemann's scientific background in biochemistry, microbiology.
Physiology distinguishes him from other attorneys. He possesses expertise in the science behind the metabolism of alcohol and drugs, as well as the details of breath and blood testing methods. He is a certified breath test operator and owns and operates various breath testing devices, including the Drager 7410, 7110, and Alcosensor IV. This hands-on experience enables him to effectively cross-examine police officers and state experts regarding the operation, maintenance, and calibration of these devices. In addition to his technical expertise, Mr. Tiemann is a qualified Field Sobriety Test Instructor, having completed the National Highway Safety Administration and International Association of Chiefs of Police DWI Detection and SFST Instructor Training Program.
He has also completed the NHTSA Drug Recognition Expert Course Overview Program. This lets the attorney challenge police officers on the results of the Drug Recognition Evaluation and how the facts often contradict the officer’s conclusions in drug DUI cases. Mr. Tiemann is a member of the National College for DUI Defense and the California DUI Lawyers Association. He has been recognized for his contributions to DUI defense and has been a speaker at various legal seminars and workshops. His commitment to continuous education and training shows his dedication to providing the highest level of defense for his clients.
