Three Tests For Determining Whether A "Defamatory" Statement Is Protected Opinion
One of the defenses you may use if you have been accused of defamation is that of protected opinion. This defense is based on the freedom of speech that is guaranteed by the constitution. However, an opinion can only be protected if it is one of these three things:
It Is Of Public Concern
Your opinion will probably be protected if it concerns a matter of public concern because the government encourages scrutiny of its affairs.