Yeah, the sniper case was helped by some leads, but in that case the law enforcement was, at first, in a big hurry to put any new evidence out to the media. I think that if the police have evidence that would benefit from public information, that's when the media coverage and interest will help the case.
Right, and that sounds just like your average kidnapping, where police are also very quick to release any evidence that's found, in the hopes that someone will connect a few dots and find the missing person.
The white van thing was immaterial. By the time they were caught, law enforcement had indicated that the suspects were travelling in a blue Caprice, whch is the car that the observant truck driver found, at a rest stop, I believe.