The obvious and short answer is that they don't and the ones they have they don't enforce, unless the press catches someone's hand in the cookie jar. How about if every earmark had to be sponsored by someone and had to be voted on as a separate piece of legislation? Then everyone would know who was benefitting from the earmark and questions could be raised. The current method is to hide the billions of earmarks in other bills, the old trick of hiding leaves in the forest.
How does an unethical Congress pass ethics laws?
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