A study from the University of Missouri-St. Louis indicates curfews work. The study relies on unannounced visits made to homes of young people on probation, people who are under orders to be in by a certain time each night. Police and juvenile officers have made more than 10-thousand of those visits in the last year. The study says crime by those in the program has been cut by two-thirds. Police say they’ve made fewer juvenile arrests throughout the city becuase of the curfews. A professor at the University says it’s part of an effort by the St. Louis Family Court to focus on prevention of crime.