it is rarely publicly declared.. often, the actual Task Force name isn't even publicized until trial time. . .. it is entirely up to newspapers to publish that kind of info, if indeed, they have it. If told not to publish, it doesn't get published.. As a tactic, keeping quiet about a particular Task Force designated for a suspected crime is standard...
I wouldn't take the absence of a headline about a particular squad taking over an investigation as ipso facto settled that nothing is happening. Not at all. .. the fact that there is , without doubt, a missing person, upon whom a massive search for was undertaken, and is still being undertook, absolutely no evidence of suicide, OR murder, OR accident, and that the present Commander has exhausted all efforts, it is highly likely, more than not, that a particular Task Force has been set up, than it is that one has not.
later newspaper reports fail to mention the absence of a specialist investigatory unit ... ...
Absence of Evidence isn't evidence of absence... .
