How to Catch an Apparator?

[Arya]

No: HPFGUIDX 73959

--- In HPforGrownups at yahoogroups.com, Ravenclaw Black 
<RavenclawBlack at C...> wrote:
> I was just thinking of something, on page 101 of the US edition:
>  
> They fell silent.  Footsteps were coming up the stairs again.
> "Mum," said George, and without further ado there was a loud crack 
and 
> Harry felt the weight vanish from the end of his bed.
>  
> It seems like wizards can apparate without having to say a 'magic 
word' 
> like other spells.  This leads me to believe that apparating can be 
done 
> without the use of a wand, which brings me to my question: how do 
you 
> catch a wizard who can apparate?
>  
> Like when Black was first cornered by the ministry, why didn't he 
just 
> apparate away?  Or when Death Eaters are in a fight going badly, 
why not 
> just apparate out of there?  I keep thinking of the opening scene 
in X2 
> with nightcrawler teleporting all other the place to get past 
secret 
> service men and into the oval office. 
>  
> Anyway, the more I think about apparating, the less of a good idea 
it 
> seems to be something from a writers point of view.  Especially if 
> words/wands are not required.
>  
> Any thoughts?
> 
> "Colin"


In OotP, as Dumbledore speaks to Fudge before portkeying Harryout of 
there, he says that if Fudge goes back into the DoM Death Chamber, he 
will find several Death Eaters bound and held there by with an anti-
apparition jinx.  

To add to your questions though, I wonder how it is that the ministry 
can effectively monitor WHO is apparating and such to such a degree 
that they are able to enforce the licensing of apparition.  What is 
to stop someone from just learning it and doing it?  Obviously, it 
can be dangerous (splinching, etc) and they certainly cannot learn it 
at Hogwarts (at least on the grounds).  

Arya