PRETTY SURE THERE HAVE TO BE ACTUAL TRIALS & CONVICTIONS BEFORE A PARDON.
Why are you yelling? And was not Hunter convicted of a crime?
President Ford pardoned Nixon, but Nixon had not had a trial or been convicted.
Nope, not the case. A person could be pardoned for all conduct up to the date of the pardon. Now, that would be unprecedented but there’s no question that it would be legal. I won’t bother citing authority but you can google or AI it very easily.