17-A M.R.S. §110: Threat to use deadly force against a law enforcement officer, transport officer, corrections officer or corrections supervisor

A person otherwise justified in threatening to use deadly force against another is not justified in doing so with the use of a firearm or other dangerous weapon if the person knows or should know that the other person is a law enforcement officer, transport officer, corrections officer or corrections supervisor, unless the person knows that the officer or supervisor is not in fact engaged in the performance of the officer's or supervisor's public duty, or unless the person is justified under this chapter in using deadly force against the officer or supervisor. A law enforcement officer, transport officer, corrections officer or corrections supervisor may not make a nonconsensual warrantless entry into a dwelling place solely in response to a threat not justified under this section.