police video shows the arrest of 40-year-old javier ambler in austin, texas, after a 22-minute chase in march of 2019. sheriff s deputies from nearby williamson county had tried to pull the driver over for failing to dim his headlights for oncoming traffic ambler later died at a hospital for years, investigators did not find any wrongdoing by police devastating ambler s family. i ve cried a lot. i have cried a lot i love my son. reporter: nearly two years later, things began to change a new prosecutor took over the case. you are pushin hard at the system. absolutely. reporter: and you re going t continue to do that? absolutely. reporter: jose garza is a number of so-called progressive prosecutors, many newly elected, promising criminal justice reform an advocacy group counts as many as 70 in the country, many taking a new look at past allegations of