There are a few ways that a DUI can be dismissed in California. One way is if the arresting officer did not have probable cause to pull you over in the first place. This could happen if the officer did not have a valid reason for thinking you were impaired, such as if you were not swerving or if you were pulled over for a minor infraction like a burnt-out taillight.
Another way a DUI could be dismissed is if the police did not follow proper procedure when arresting you. For example, if the police failed to read you your Miranda rights, or if they did not give you a chance to take a chemical test to determine your blood alcohol content (BAC), then your DUI charge could be thrown out.
Finally, sometimes DUIs are dismissed because of problems with evidence. For example, if the police did not properly calibrate the breathalyzer machine used to test your BAC, or if there was something wrong with the blood or urine sample used to test your BAC, then your DUI charge could be dismissed.
If you have been charged with DUI in California, it is important to talk to an experienced DUI attorney who can look at the facts of your case and see if there is any way to get the charges against you dismissed.