A little over 20 years ago I was rear ended and dutifully went to court, per supeana, to testify. As I sat there, I noticed an elderly African-American gentleman sitting in the court room waiting as well. He was dressed in old, used looking, but quite clean work clothing. He did look somewhat comfortable with himself. When his case was called, he walked up in front of the judge and announced that he wished plead not guilty and to act in his own defense. I remember thinking, somewhat derisively, of the old addage that a man who represents himself in court has a fool for a client. I think everyone there probably had him pegged as a stereotype.
The prosecutor called the ticketing policeman, who testified about clocking the defendent on radar, and the speed he was going, which resulted in the traffic stop and the ticket. The prosecutor sat down and indulgently awaited the gentleman's attempt at defense. The gentleman asked how the cop knew the radar gun was correct. The cop replied he had tested it against the police car used as the chase car. He was then asked how he knew the chase car's speedometer was correct. The cop replied he had checked it with the radar gun.
There was an immediate change in the courtroom. The judge quit looking bored and was leaning forward to listen as the cop stumbled with his replies. The prosecutor looked like he had stepped on a snake as he quickly got to his feet. He allowed to the judge as how based on the recent testmony, he would like to drop all charges. The judge had no problem with that and immediately ordered it so. The gentleman thanked the court and left.
That was in Prince William County, Virginia. Maybe things have changed?