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The effort to keep schools safe from mass shooters has ballooned into a multibillion-dollar industry. Companies are selling school districts assurance with high-tech products.

A student opened fire at Wilmer Hutchins High School in Dallas last year. He was sentenced to five years in prison Tuesday.

Dallas County officials chose back National Gun Violence Awareness Day, which is Friday. Texas legislators have passed several pro-gun measures during this session.

Another student may have opened the door for the suspected gunman at the southern Dallas high school, but it’s not clear why or how he may have obtained a gun.

The student accused of injuring four in a shooting at Wilmer-Hutchins High School was let into the building through an unsecured door and then walked down a hallway toward a group of students, opening fire on them. That is according to an arrest warrant released Wednesday.

A 17-year-old was arrested and booked into the Dallas County Jail Tuesday night.

A three week trial targeting the shooter’s parents Antonios Pagourtzis and Rose Marie Kosmetatos, who prosecutors said failed to prevent the massacre and get psychiatric treatment for their son, came to a halt late Monday when a jury found the pair not legally liable.

Timothy Simpkins is serving a 12-year prison sentence for attempted capital murder for the Arlington school shooting. State prosecutors brought more charges against him.

Dallas Independent School Board Place 5 Trustee Maxie Johnson, whose district includes Wilmer-Hutchins High School, hosted a community discussion Tuesday night on the shooting that left one student injured.

The student was transported to a hospital after bringing a gun to Pioneer Technology and Arts Academy Oates Campus, police said.

The now-16-year-old opened fire in front of Lamar High School in March, killing 16-year-old Ja'Shawn Poirier and injuring a female student on the steps of the school.

The now 16-year-old shot two fellow students outside Lamar High School in Arlington in March, killing one. He now faces sentencing for capital murder and attempted capital murder.