I have been involved with a missing persons search. LE will do their preliminary work and search areas of interest sometimes with all the resources they have. Helicopters, search dogs, equipment, feet on the ground, etc... but in a relatively short period of time they just don't anymore. That is why volunteers and organized volunteer search and rescue organizations step in and are so very important. In my experience and reading cases on here, unless there is huge new evidence you're on your own with actual feet on the ground searches and only have the info LE has given you which is sometimes not much at all.