Quote Originally Posted by Thomas Bertilsson View Post
Is a model release form necessary when photographing in a public place?
For commercial use, yes. Even in a place where there is no reasonable expectation of privacy.
Now define commercial.

If someone is recognizable as the OP states you cannot use the photo to endorse a product without a release. This is fairly straight forward.

For "editorial" use you are generally okay.
Notice how I used the words editorial and general.
This is a much grayer area.

Hope I cleared that up