Harry's Use of Cruciatus curse and why no one noticed

[Sarah]

No: HPFGUIDX 110026

> Cory wrote:
> Another thing that bothered me almost as much, however, was how come 
> his use of Cruciatus went so unnoticed by everyone?  The Ministry 
> seems to know what Harry is doing 24/7; he was threatened with 
> expulsion from Hogwarts for dumping his aunt's pudding in the floor, 
> casting a Patronus to defend himself, and borrowing a flying 
> car...but he casts an Unforgivable Curse inside the Ministry building 
> and no one cares?

> Kemper thinks:
> Those incidents occur during summer holidays.  Maybe the Deparment 
> that's in charge of monitoring magic of the underage takes a well 
> deserved rest during the school year, focusing mostly on the antics 
> of those witches and wizards aged 11 and younger.

Is it possible that the Ministry uses a bit of deduction in catching 
underage magic?  After all, the falling pudding was made to do so by 
Dobby, but it just happened to occur at the registered home of one 
Harry Potter.

Same with the dementors--in Harry's neighborhood, but 
the MoM did not seem to know that the Dementors were there.

The only reason the Ministry would know HP performed the Cruciatus curse 
is if Bella told (and she's not telling) or if HP revealed it, after 
all, there were over a dozen there at the time.  If they didnt know 
who smashed the pudding or why HP did the Patronus, how could they 
know that he did the Cruciatis?  

"Sarah"