My SAR friend who took part in the search doesn't have any vacation time saved up this year because it has been spent on training and other call-outs already. This means that she drove something like 12 hours each way and had to take three uncompensated days off work in order to help with the search. Her situation is not atypical at all.
If the rumour is correct, then her donation of her time, energy and expertise would have been for nothing.
When I was involved in SAR, LE agencies were usually almost apologetic about call outs, assuring us over and over that they were sharing the best information they had, saying over and over they wished they had more information to share.
I find it hard to believe that any LE agency would abuse the good will of so many SAR personnel that way. For one thing, call outs are optional, not mandatory. An agency that had a record of calling out without good reason would quickly find that the number of responders drops dramatically (this has happened in a few isolated cases).
For another, abusing SAR personnel that way would just not be ethical and the vast majority of LEOs are fine, ethical people.