Someone I met on my way
No, it is not required, but it never hurts to obtain a release, and if you intend to use or license your image commercially, then it’s much easier to get a model release immediately before or after photographing a subject than it is to try to track down a stranger for a waiver after the fact. However, simply photographing a person in public view — including children and law enforcement officials — does not require either a model release or expressed consent.