Melanie Weaver, police officer, California Highway Patrol, weighs Giavanna Escobar, 6, while explaining car seat weight limits during the Marine and Family Safety Fair at the Combat Center Exchange parking lot, April 28, 2014. “The National Highway Traffic Safety Administration estimates that approximately 80 percent of all car seats are used incorrectly,” Weaver said. “A lot of people don’t know, but car seats are like milk, meaning they expire.” - Melanie Weaver, police officer, California Highway Patrol, weighs Giavanna Escobar, 6, while explaining car seat weight limits during the Marine and Family Safety Fair at the Combat Center Exchange parking lot, April 28, 2014. “The National Highway Traffic Safety Administration estimates that approximately 80 percent of all car seats are used incorrectly,” Weaver said. “A lot of people don’t know, but car seats are like milk, meaning they expire.”