I would disallow pardons made between a few days before an election and an inauguration (for those sentenced before the election). This would provide a small amount of accountability, even for a president who already served two terms. I think it would be enough to discourage an Executor from pardoning all but the people he truly feels were served an injustice.

 

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On his last day in office Arnold reduced the sentence of his buddy Fabian Nunez' son, and when ask why he said it is what you do for a friend.

 

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Having pardons means the justice system is broke.

For instance, countries like thailand give out pardons to foreigners because they impose stupid sentences like 20 years in jail for having a little cocaine on you. It makes them look bad when a white person gets busted so harshly, so their king or whatever they call it hands out a pardon. No question, thy have a crappy justice system.