The Department of Justice yesterday filed a brief in opposition to a preliminary injunction in the State of Washington v. U.S. Department of State, a case about 3D printed guns.

After the filing, Attorney General Jeff Sessions issued the following statement:

"Under federal law, it is illegal to manufacture or possess plastic firearms that are undetectable. Violation of this law is punishable by up to five years in prison. Such firearms present a significant risk to public safety, and the Department of Justice will use every available tool to vigorously enforce this prohibition. We will work with federal, state and local law enforcement to identify any possible cases for prosecution.

"We will not stand for the evasion, especially the flouting, of current law and will take action to ensure that individuals who violate the law by making plastic firearms and rendering them undetectable, will be prosecuted to the fullest extent."

Please find the Justice Department's brief here.