I received a parking ticket in Oakland for parking in a 2-hour for less than 15 minutes, leaving, and then returning 3 hours later. I had evidence that I was not at the location in between. The parking department didn't care, because their claim wasn't that I couldn't prove I had left, but rather that even what I claimed was illegal.
My online appeal was denied, my written appeal was denied, and my administrative hearing was denied. I paid an $83 fine and a $25 fee to file an appeal in court. Three months exactly after the supposed violation, a county judge dismissed my ticket. The city returned my $108.
The judge said there was literally nothing I could do to prevent the same situation in the future (ie, there is no feedback loop), but that I would prevail in court again.
This situation affects me regularly because I don't own a car, so I rent one hourly, drive to my residence, pick up my wife, go grocery shopping, return to my residence, and then eventually return the car. The Oakland parking department continues to believe that my actions are illegal.