Generally, what can be seen from public view can be photographed without legal repercussions. Photographs taken in private places require consent.
Even if people are photographed in public, beware of the context in which the picture is placed, such as an innocuous photo of recognizable teenagers in a story about the rise of teen violence. Use caution when utilizing file footage or photographs to illustrate negative stories. Special effects can be used to render the subjects unidentifiable.