As of May 21, 2014, ALL DOT medical card testing must be done by a Certified Medical Examiner from the National Registry. You may find qualified examiners in your area by going to the website:
nationalregistry.fmcsa.dot.gov
If your company makes you go to a specific doctor for your DOT physical, make sure they are on the Registry. Remember, it is your responsibility to keep your DOT medical card current. Protect your job!