There is no punishment for the law. The law is on the books but there is no punishment. Curfews treat all youth as violators. It turns off good kids and is unfair to them. They said that a curfew compels parents to be more responsible and gives them a specific reason to tell their children they cannot be out after a certain time, and they said that curfews are a good prevention tool, keeping the good kids good and keeping the at-risk kids from becoming victims or victimizers.
Prevention is nine-tenths of the cure.
Because of the curfew there is less gathering. Less gathering means fewer calls for police. Nineteen cities said that a nighttime curfew was not a useful tool, explaining that it removes parental control as the city, in effect, becomes the parent. They also commented that more crime happens during non-curfew hours due to curfew enforcement. All youth, not just delinquents, are affected by a curfew.