There's plenty of other examples, and it's all well and good to assume the legal system will smile nicely on your good reasons until it doesn't.
Case in point:
A buddy got charged with drunk driving in BC while driving home the morning after a Whitecaps game. BC has a similar roadside system for DUI, with no easy system for appeal. You blow over, you're done driving for 90 days and your vehicle is impounded immediately. Forget court. This is doubly complicated because they have a two-tier system with one punishment of a BAC of 0.05 and another for 0.08 and greater. He blew 0.09, so full meal deal.
Fortunately for him, he was well off enough to pay a lawyer a lot of money to fight his case, which initially got a total stonewall from the appeals and arbitration system. As he 100% knew he was fully sober (wasn't particularly drunk the night before and slept 8+ hours in his office to be extra safe), he was willing to go to the wall to fight, and so kept paying the lawyer.
Eventually, out of pure luck, someone noticed that the breathalyser calibration sheets were all identical except for the serial number written in for each unit. Turns out the cops were calibrating one unit with the serial number blank, photocopying that sheet, then writing in the serial number in for each uncalibrated unit.
So after three months with a suspended license, thousands in mandatory impound fees, and a mountain of legal bills, the arbitrator quietly cancels his ticket and tells them to go away. He got the money for his ticket back, but no refund on the impound fees and zero compensation for the legal bills. If he was some delivery driver making a lower wage, dependant on his job to feed his family, it would have been a much different outcome, as the money wouldn't have been there to pay the lawyer and nobody would have been the wiser. A number of other folks had their 'convictions' thrown out, which must have been a pleasant surprise for them...
Here's a news story covering the incident:
Drunk driving cases tossed due to bad paperwork