Floo and Fireplaces, Hagrid

[Tom Wall]

No: HPFGUIDX 69849

Just a quick note on this topic...

If the Floo Regulation Panel is monitoring all fireplaces at Hogwarts, 
and this is why Harry has to use Umbridge's fire to contact Sirius at 
Grimmauld Place, then...

...Grimmauld Place is connected to the Floo Network, no? I mean, in 
order for Sirius to contact Harry via Floo powder, the fireplaces must 
both be connected to the network.

Could this be a potential hazard in the future? How come no one has 
caught on to this? HAVE they caught on, and could a spy/Death Eater be 
using information gained from fireplace communications? What about 
Dumbledore as Secret-Keeper for the Order? Can the Floo location be 
deduced without Dumbledore revealing the sealed information?

-Tom