me_irl

That's all you're really expected to do, be a momentary observer along with thousands of others all over the place. We don't have, and don't want, enough cops to look everywhere. But if by chance that license plate is right in front of you in traffic, or that man and toddler who just did a complete change of clothes in the bathroom (not suspicious behavior in itself) were originally wearing clothes that matched the description, you can call the number on your phone. Normal custody battles don't get elevated to an Amber alert.