Gunmaker Remington Arms, the principle defendant in the Sandy Hook lawsuit, filed a motion to keep some portions of the discovery materials in the case out of public view, according to documents.
The gunmaker is being sued by the families of children and adults killed in the 2012 Sandy Hook Elementary School massacre.
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The Madison, North Carolina, company made the Bushmaster semiautomatic rifle that Adam Lanza used to kill 20 first-graders and six educators in Newtown in December 2012. A similar weapon was used this month in a mass shooting at a Florida nightclub.
Attorney James Vogts argued Monday the lawsuit should be dismissed on several technical grounds. Lawyers for Remington continue to argue the lawsuit is barred by a 2005 federal law, the Protection of Lawful Commerce in Arms Act, which shields gun manufacturers from most lawsuits over criminal use of their products.
A state judge in Bridgeport didn't immediately rule.
The families of nine children and adults killed at the Newtown school and a teacher who survived are suing Remington Arms, the Madison, North Carolina-based parent company of Bushmaster Firearms, which made the XM15-E2S rifle used in the shooting. They say the company knew its AR-15-style rifle was meant for the military and was too dangerous to sell to civilians.
Debate over whether AR-15-style rifles should be legal has intensified following the shooting at an gay nightclub in Orlando by a gunman with a similar rifle, made by Sig Sauer, that left 49 people dead and dozens of others injured.
Although the Orlando shooting probably won't be admissible in the Connecticut case, it likely will be on the minds of jurors in a potential trial, said W. John Thomas, a law professor at Quinnipiac University. AR-15-style rifles have been used in other mass shootings.
In Newtown, gunman Adam Lanza used a Bushmaster rifle legally purchased by his mother to kill the 26 victims. He killed his mother before going to the school, where he fatally shot himself as police arrived.
The Remington attorneys disagree with the victims' families' lawyers, who say an exemption in the federal law allows litigation against companies that know, or should know, that their weapons are likely to be used in a way that risks injury to others.
The families' lawsuit alleges Remington violated the Connecticut Unfair Trade Practices Act and the common law of "negligent entrustment," which was designed for cases such as when a gun store sells to someone who is obviously intoxicated and threatening to kill someone.
In addition to Remington Arms, the defendants also include Camfour, a firearm distributor, and Riverview Gun Sales, the now-closed East Windsor store where Lanza's mother, Nancy Lanza, purchased the Bushmaster rifle in 2010.