Counterfeiting US currency is a federal, not state crime. So police should ignore when they find a counterfeiting operation, and not tell the Secret Service, right? 

If someone wanted on a Federal charge, like kidnapping or murdering a Federal marshal, and it didn't happen in Colorado, but the warrant is found while the guy is held overnight due to a bar fight, the police should just set him free when he posts bail for the local charge?

How about someone wanted in another state for a crime? Shall we no longer tell anyone if they are picked up on a local charge? After all, why should Colorado worry about some rapist from Nevada passing through? Not our job to enforce Nevada laws, right? Seems like criminals should be able to literally get away with murder if they can just get to a state that doesn't want to enforce any law but their own, using the logic that we don't assist anyone but Colorado law enforcement or worry about people breaking any laws but Colorado's.