The law is considered the " toughest " , " strongest " and " most comprehensive " legislation relating to gun control in the United States , according to media outlets and advocacy groups . The legislation was introduced in response to the Sandy Hook Elementary School shooting , which occurred on December 14 , 2012 . Perpetrator Adam Lanza shot and killed 26 people , including 20 children , after murdering his mother and stealing her legally purchased firearms . Under Connecticut General Statutes in force on December 14 , 2012 , Lanza was in criminal possession of firearms after murdering his mother and as he left his home and headed to Sandy Hook Elementary
Sandy Hook Elementary School shooting
Sandy Hook Elementary School shooting
An Act Concerning Gun Violence Prevention and Children's Safety