Depending on the state, there can be. Consider this recent article by the CATO institute:
“Under Ohio law, it isn’t illegal to buy gold, it isn’t illegal to sell gold, and it isn’t illegal to talk about buying and selling gold. But—and it’s a significant “but”—if you talk about buying gold, you’re not allowed to actually buy any. At least not without a license.
That’s right: in Ohio, it’s illegal for anyone who advertises a willingness to buy gold to do so without a license. Obtaining and maintaining that license isn’t easy, or cheap. Licenses must be renewed every year, and license holders have to make daily reports to the police detailing their purchases. This law creates a two-tiered system: dealers who have complied with the onerous licensing regime may freely advertise their businesses, while others can’t so much as put up a sign reading “We Buy Gold” without facing criminal prosecution and fines of up to $10,000 per transaction.”
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