[Ol' Dan Tucker]

Why should a county sheriff be concerned with federal law and (2) why should a county sherriff be in a position to profit from his interpretation of and interest in federal law?

Because they get to share in a portion of the largess they seize when enforcing federal law. (Civil Asset Forfeiture)

[Still Thinking]

Exactly my point. That’s wrong. They should not have a conflict of interest and shouldn’t even care much about federal law. If the feds want to enforce laws, they have their own agencies to enforce them.