FILE - In this June 18, 2014, file photo Cobb County police investigate an SUV where a toddler died near Marietta, Ga., when the father forgot to drop his child off at day care and went to work. A proposed... (Associated Press) 
 
 A proposed law that would require carmakers to build alarms for back seats is being pushed by child advocates who say it will prevent kids from dying in hot cars. 
 
 The law also would streamline the criminal process against caregivers who cause the deaths — cases that can be inconsistent but often heavier-handed against mothers. 
 
 The latest deaths came in Arizona on triple-digit degree days over the weekend, with two baby boys found forgotten in vehicles in separate incidents. 
 
 More than two dozen child and road safety groups are backing the U.S. Senate bill introduced last week aimed at preventing those kinds of deaths by requiring cars to be equipped with technology that can alert drivers if a child is left in the back seat once the vehicle is turned off. It could be a motion sensor that can detect a baby left sitting in a rear-facing car seat and then alert the driver, in a similar way that reminders about tire pressure, open doors and seat belts now come standard in cars. 
 
 "The technology would help because if you're in a vehicle, your child is in the back seat, and you ignore that alarm: Go to jail. Do not pass go. You had a chance," said Janette Fennell of the advocacy group Kids and Cars.org. "You talk to any of the judges, they'll tell you, they're beyond the hardest things they have to deal with." 
 
 Police say 1-year-old Josiah Riggins was in the car for hours Saturday, discovered dead only after his father drove roundtrip, twice, between their suburban home and a Phoenix church to drop off the mother and a sibling. 
 
 Zane Endress, who was 7 months old, died Friday in Phoenix after being left in the car in the driveway at home, as his usual daycare drop-off routine was lost by his grandparents. 
 
 "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." 
 
 No charges have been filed against the caregivers in either Arizona case, as police say the death investigations are underway. Detectives will determine criminality based on the caregiver's neglect, intent and mindset, while also being sensitive to the family's deeply felt loss of a child, Phoenix police Sgt. Mercedes Fortune said. 
 
 "Those are the very difficult questions. Each case is different. I can't tell you there's a set answer for any case because there really isn't," Fortune said. 
 
 Kids and Cars, which has tracked more than 800 children who have died in this way since 1990, said criminal cases vary greatly, even when the circumstances are identical. Fennell said 90 percent of cases involve pure accidents, most likely a child forgotten by an adult. 
 
 In this month alone, a Tennessee couple was charged in the death of their 11-month-old daughter. A nearly 2-year-old boy was found dead in his father's BMW in south Florida. 
 
 The nonprofit's analysis shows charges are filed about half of the time, though very rarely are the parents found guilty objectively because it was proven that the child was left behind to be harmed. There is also a noted gender bias: Mothers are more often charged than fathers, and among the convicted, women caregivers receive longer prison sentences than men, the study found. 
 
 "It's also a defense mechanism. If I make monsters out of these people, then it could never happen to me," Fennell said. 
 
 ___ 
 
 Follow Sally Ho at http://twitter.com/_sallyho ||||| For the second day in a row, a baby boy has been found dead in a hot car. 
 
 The 1-year-old has been identified as Jasiah Riggins. 
 
 On Saturday afternoon, Phoenix firefighters were called to the Free Church of God parking lot 28th Street and Broadway Road for a report of an infant left in a hot car. 
 
 According to Phoenix police, the child was first left in the hot car at another location on Gilbert Road just north of Main Street, not the Phoenix church parking lot. 
 
 Police say Jasiah was discovered dead only after his father drove round trip, twice, between the apartment complex and the church to drop off the mother and a sibling. 
 
 Initial reports are that the child was in the vehicle about two hours. 
 
 Phoenix police said there was no evidence of foul play and it appears to be an accident. 
 
 No arrests have been made. 
 
 Police say this is a tragedy that could have been avoided. 
 
 "Unfortunately, we hear this, that parents forgot their baby in the vehicle," said Sgt. Mercedes Fortune with the Phoenix Police Department. "Yesterday, we had another incident like this. We just ask that you take some time. Again, look inside your vehicle before you put it in drive and before you go anywhere, so you can avoid these tragedies." 
 
 A crisis response team in responding to assist the family. 
 
 Infant died in hot car on Friday 
 
 Tragically, this is the second deadly hot car incident in just two days. 
 
 On Friday, a 7-month-old boy died after being left in a hot car in north Phoenix. 
 
 [RELATED: 7-month-old boy dies after being left in a hot car in northeast Phoenix] 
 
 That baby has been identified as Zane Endress. 
 
 The car was parked in a residential neighborhood near 44th Street and Greenway. 
 
 Phoenix police said he was in the care of his grandparents at the time. No arrests have been made. Police believe the family may have been returning from work, parked their car, and possibly forgot the baby was still inside. 
 
 It would be several hours before a family member discovered the boy and called 911. 
 
 #BREAKING: Phoenix police release name of 1-year-old boy who died after being left in a hot car today: Josiah Riggins — Maria Hechanova (@MariaHechanova) July 30, 2017 
 
 #Breaking Just got to the scene. 1-year-old girl found dead in a hot car. pic.twitter.com/T96l9uR1jl — Maria Hechanova (@MariaHechanova) July 29, 2017 
 
 Crime tape surrounds a church parking lot @azfamily pic.twitter.com/Tx0THrExaT — Maria Hechanova (@MariaHechanova) July 29, 2017 
 
 Click/tap here to download the free azfamily mobile app. 
 
 Copyright 2017 KPHO/KTVK (KPHO Broadcasting Corporation). All rights reserved.
– It's an avoidable tragedy that authorities across America want to make as rare as possible—but in Phoenix, it happened twice in two days. The first baby to die in a hot car in the Arizona city over the weekend was 7-month-old Zane Endress, who was left in a car for hours on the city's north side on Friday afternoon, AZFamily.com reports. Police say the boy was in the care of his grandparents at the time. They believe a family member may have forgotten the boy was in the car after returning home from work. No arrests were made. In the second death, 1-year-old Josiah Riggins died Saturday afternoon in the back seat of a car in a church on the city's south side, 12 News reports. Police say Josiah wasn't discovered until after his father had made two trips between his apartment complex and the church to drop off his mother and another relative. Police say the Riggins death also appears to be accidental and no arrests have been made. The deaths were the first of their kind in Phoenix this year. The AP reports that dozens of safety groups are urging the Senate to pass a recently introduced bill that would equip cars with sensors that could detect when a child is left in a rear-facing car seat and set off an alarm if one is left behind. "A simple sensor could save the lives of dozens of children killed tragically in overheated cars each year," bill sponsor Sen. Richard Blumenthal said in a statement last week.