A proposed law requiring alarms in the back seat of cars, while also streamlining the criminal process against those that leave children unattended in cars will soon go in front of the U.S. Senate.

Over the triple-digit weekend in Arizona two baby boys were found dead in the back seats of cars.

Police say 1-year-old Josiah Riggins was found on Saturday after spending hours alone in the car.

7-month old Zane Endress died Friday after being left in the car in the driveway at his home.

Nonprofit Kids and Cars has tracked more than 800 children who have died in situations like this since 1990. They say these cases vary greatly, even in identical circumstances. Kids and Cars analysis shows that charges are only filed about 50% of the time, though guilt is often never found.

“A simple sensor could save the lives of dozens of children killed tragically in overheated cars each year, and our bill would ensure such technology is available in every car sold in the United States,” bill sponsor Sen. Richard Blumenthal, a Democrat from Connecticut, said in a statement. “It can take mere minutes on a hot day for a car to turn into a deathtrap for a small child.”