St. Louis prosecutor ends effort by police to treat 17-year-olds as juveniles while in custody St. Louis Circuit Attorney Kimberly Gardner is among the majority of prosecutors still treating 17-year-olds as adults despite passage of a new Missouri law Author: Christine Byers (KSDK) Updated: 2:18 PM CST January 29, 2021 ST. LOUIS — For about 36 hours this week, the St. Louis police department tried to do what it could to treat 17-year-olds as children. A new law known as Raise the Age was supposed to take effect statewide Jan. 1, increasing the age of those ...