[Miss Marple]

They aren't following Stern because (unlike the nutty astronaut gal) there isn't a schedule so that they can simply go to a pre-determined place (like an airport) and wait for him to appear.

Stern is avoiding the press and so it would require some actual work in order to find him. Since they are lazy, they won't do it.

I also would bet that Howard Stern is a democrat, and that, of course, would give him a protective shield.

[sarasota]

Maybe Stern is sailing on the new yacht.