You do not have to wait 24 hours to report someone as missing if you feel the disappearance is of a suspicious nature. You can and should report them missing immediately.
Photographs of missing persons are generally given to the media if the missing person is very young, very old, has a life threatening medical condition, or if foul play is suspected. Photographs of missing juveniles are never released without permission of the parents or guardians. Most news media organizations will not broadcast or publish photographs of runaway juveniles, or adults who have voluntarily absented themselves.
Louisiana's Amber Alert program has very specific criteria for when the system may be activated. When these criteria are met, Baton Rouge Police Department will take the steps necessary to activate an Amber Alert.