Specifically we watched a show the other day on ID where a young man or his mother shot and killed his abusive father. The judge threw out much of the evidence against the other wise stand up, stand out young man. So he could not be charged with murder because they could not tell which of them did the shooting or under what conditions.
He had however not been able to buy a shotgun because he was a Canadian citizen. He duped a friend into buying it for him. It was the gun used in the shooting.
So here is the differential enforcement part. He plead, probably to protect the friend and mom. But the sentence even with a plea could have been anywhere from the few months he had already served to 25 years! In other words the ridiculous discretion given to the judge allowed him to sentence the young man for the murder he was not convicted of! And the judge did. Twenty years.
IMO, no crime should carry such a discreation in sentencing. The case occurred in NYS but the gun charge was federal.
Then there is the whole deal of charging acquitted people with federal civil rights violations. Or "crimes" like petty gambling any of us could be charged with if they wanted us to roll on someone. And other crimes that are either rarely enforced or rarely result in the ridiculous max sentence unless....
I'm sure you can all think of related examples. To me differential enforcement is one of the most effective tools of tyranny.