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The first step in reporting improper police conduct is the department's Internal Affairs Division. They are the ones who investigate police misconduct
Second, if he did not know and had no way of knowing that their vehicle was actually a police vehicle, then any citation for failure to pull over or yield to an emergency vehicle would not be able to be proven in court. Thus, he needs to go to court and plead not guilty and he needs to go to trial
and show they were not in a properly marked police vehicle, but in an unmarked van with only a flashing light and no uniforms and this would be reasonable doubt that he did not intentionally failure to yield or stop for the emergency vehicle. He is entitled to an attorney so he should get one or get the public defender to represent him on this matter in court.
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