I don't know if this helps or not, but back when I partook in searches, a member of the LE coached us before we went out together as a group. Had us wear orange vests, we all went step by step together- everyone was to look out for the people on either side of them to make sure no one got lost during the search.
We were instructed to not touch a thing that we found, but to call out "I found something" and to just stay where we were. the entire group of us halted and didn't move until LE came over, looked at what was found, and either bagged it as evidence or said it wasn't relevant. We would proceed only after the LE said we could. We did this for several miles, to which only one piece of evidence was found. so yes, volunteer searches by local folks should have been done a long time ago, even done right now, with a member of LE instructing them like they did with us to prevent people from getting lost or hurt. time is wasting, and if there is any evidence out there to be found, now is the time to get out there and find it, before the snow starts to bury it and any possible dna evidence. it's not very easy to search in the snow and cold, trust me. Done it a couple of times, even got a nasty cut on the bottom of my leg which bled a bit, but i still plodded on, and then of course, i stepped in a huge puddle that was under some ice that a few guys had already crossed, but of course, yours truly broke the ice when she walked across it.