Establishes "MarcAnthony's Law;" criminalizes use of defaced or stolen firearm to injure police officer; enhances penalties for defacing firearm.

MarcAnthony's Law criminalizes using defaced or stolen firearms to injure police officers, with different penalties based on the severity of injury. Using such a firearm to cause serious bodily injury is a first-degree crime, while causing bodily injury is a second-degree crime. The law defines a firearm as not defaced if it's merely refinished, rusted, or damaged from ordinary wear and tear without having been used in a crime. It also enhances penalties for defacing firearms (upgraded from third to second degree) and possessing defaced firearms (upgraded from fourth to third degree), with increased prison terms and fines.