Effective in May 2014, additional requirements become effective regarding the Commercial Drivers' License medical exam.

In 2012, the Federal Motor Carrier Safety Administration (FMCSA) passed new regulations regarding the standardization of physicians who administer the medical test. Doctors are now required to register with the National Registry database, to ensure that they are qualified to perform the requested exam. The restriction applies only to interstate truckers.

A CDL-holder in California must take and pass a medical exam at least once every two years.

As a rule of thumb, anyone who drives anything larger than a passenger car must have a CDL in California. It's best to keep a copy of your most current medical exam results with you at all times. Not everyone is required to present the certificate on demand, but some drivers must do so.

Before you can receive a CDL, a doctor must declare you physically fit to operate a commercial vehicle.

It's incumbent on you to file the form with the DMV in Sacramento.