What if I did something that was a crime, but has now become legal? There was a question recently about what happens if I do something that is legal today but becomes illegal in the future. The obvious question is what happens in the opposite case? If I do something today that is a crime by today's laws, and next week the law changes and makes the act legal? Can I be convicted by a judge for something that is today legal? Where everyone in the court room, including the judge, would be allowed to do it today? Does it make a difference if I got caught before or after the law change? Would a judge have legal leeway (that is it's up to him to decide if I should be prosecuted or not?) If I was already convicted, would I have reasons for an appeal with the argument that my actions are not illegal (anymore)?
According to United States federal law, 1 U.S. Code § 109 - Repeal of statutes as affecting existing liabilities: The repeal of any statute shall not have the effect to release or extinguish any penalty, forfeiture, or liability incurred under such statute, unless the repealing Act shall so expressly provide, and such statute shall be treated as still remaining in force for the purpose of sustaining any proper action or prosecution for the enforcement of such penalty, forfeiture, or liability. The expiration of a temporary statute shall not have the effect to release or extinguish any penalty, forfeiture, or liability incurred under such statute, unless the temporary statute shall so expressly provide, and such statute shall be treated as still remaining in force for the purpose of sustaining any proper action or prosecution for the enforcement of such penalty, forfeiture, or liability. So it depends on whether Congress expressly said what to do, and if they didn't say anything, it defaults to being able to still prosecute. But this only applies to federal laws, not state laws. There's also an exception to this. In United States v. Chambers, 291 U.S. 217 (1934), the Supreme Court said that a prosecution for a violation of the National Prohibition Act could not be continued. However, this was a special case, as the constitutional provision (the 18th Amendment) that allowed the act in the first place had just been repealed (by the 21st Amendment).
(assuming United States law here, though I'd be surprised if it were significantly different in other jurisdictions with such restrictions) Your friend is incorrect: that would be a new offense, for which Person A could be prosecuted anew. If your friend's logic were correct, once a person is convicted of robbing a store, they'd be free to rob that store without repercussions for life. It's worth noting that the conviction isn't relevant: the prohibition of double jeopardy in the United States prevents even multiple prosecutions (except, in some cases, for separate state and federal prosecutions or foreign prosecutions).
Would it be legal to jump into an unlocked car and start it? No. Same situation, different object.
You will still have to pay A ticket can be ammended if the state so chooses (they can look up what color and model your car is). The car is probably on video. The officer can testify if they wrote your car info down somewhere else. And if they identified you inside the car as the violator, the car's color hardly matters. The idea that minor mistakes or omissions on tickets can get you off is a myth. From an actual lawyer
Is such legislation that effectively overrules a court imposed sentence even allowable? Yes. Amnesty legislation is allowed. For example, the U.S. Congress recently passed such legislation with regard to crack cocaine sentences. Legislation changing sentences for crimes is presumed to be prospective only, but this presumption can be overcome with clear statutory language to the contrary. As a political matter, however, district attorneys usually lobby strenuously against amnesty legislation, feeling that it sets a bad (political) precedent. an existing NH truth in sentencing statute would seem to conflict with the notion that any such change is possible. In the event of a direct conflict between an older statute and a newer statute that can't be resolved by any other interpretive method, the newer statute prevails over the older one, even if this result isn't expressly identified in the legislation.
Is this legal for the county to enforce? Yes. And can I sue if they try to enforce it? You could, but you would very likely lose your lawsuit. A more fruitful approach would be to go to the county planning board and seek a variance to permit you to do what you want to do.
You are right, the entry and exit photos are only evidence that you were there. This is something they need to prove so the photos may only be for that. Their statement that you didn’t display a valid ticket/permit is, at present an unevidenced assertion. If you contest this, they will provide evidence that you didn’t (e.g. the actual records they refer to) and you would provide evidence that you did and, if it goes to court, the judge will decide what evidence they prefer. As this is not a criminal matter, they need to prove the offence on the balance of probabilities. However, there are almost certainly administrative remedies which will allow you to contest the fine without going to court. This would involve you sending them a copy of the permit and them assessing whether their belief that you didn’t display it is justified or not.
The jury never finds there was “no crime” They either find that the state has proven that this particular defendant committed this particular crime (guilty) or they have not proven it (not guilty). Another jury at another time may find the opposite - this does sometimes happen where a guilty verdict is appealed and the appeals court orders a retrial. For another defendant charged with a different crime (e.g. accessory to the first crime) before another jury, the result of another trial is both irrelevant and inadmissible.