Is it Against the Law to Film a Police Officer

well, the problem with the Florida situation, as I see it;

the law was not actually challenged on a constitutional basis. What was contested was the applicability of the law in regards to the situation. Since the guy was not arguing the charge itself but the arrest, the constitutionality of the law was not in question but whether the officers actions were proper given the circumstances. It was ruled that the officers actions were acceptable.

Now, if the guy was actually prosecuted for the violation, then he could have challenged the constitutionality of the law but as it was, that was not the question at hand.