Imagine this: a black box in your car tracks how many miles you drive, then the government taxes you based on the total. It could become a reality someday, with some states looking to test out the idea with the hope of eventually bridging revenue shortfalls.

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The federal government may also try to move in this direction, with analysts saying taxes on gas purchases aren't generating enough money anymore. The government says more tax revenue is needed to maintain highways.

Judge Andrew Napolitano stopped by Fox and Friends this morning to take on what he sees as yet another example of the drive toward Big Brother policies.

He disputed the notion that drivers would instantly benefit from the tax in the form of highway improvements, arguing the revenues would actually go to the "general treasury of the state" like any other tax.

"To say we need the black box so that drivers pay their fair share of using the highway is ridiculous. ... It's just more money for the bureaucrats to spend," he said.

Napolitano says states have seen the federal government get away with "spying on everybody under the sun," and now the states "want their piece of spying."

The judge says Americans need to look at stories like this and think about the fundamental question of whether they want the government watching "everywhere we go and everything we do."

Watch the full interview and tell us what you think of this new idea.

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