FYI, that is 100% something a cop can do in the US. They have no obligation to warn you not to commit a crime, and are legally allowed to even encourage you to do a crime. They can provide all the means and motivation to do a crime, and if a jury can be convinced that you would have crimed anyway if you had those resources through other means, it's not entrapment.

I think a reasonable person would agree that if you ask a cop if you can do something and they won't answer but then take enforcement action against you later on, that would be bullshit.

Of course that all depends on your belief that the cop didn't give you an earlier answer that you ignored.

It acts like a security, smells like a security, trades like a security, but it's NOT A SECURITY, so give me new laws for this thing I won't define!