Using the Piensive by eye Witnesses

[sawsan_issa]

No: HPFGUIDX 91453

This has probably been brought up, but in PoA, the eye witnesses to
Peter Pettigrew being scabbers were HRH, Werewolf Lupin, and Convict
Black, who were all considered weak witnesses. Well, we know from
later books that the Piensive can withdraw thoughts, memories, etc as
they are for further analysis. So why couldn't Dumbledore use the
piensive of all of the eye witnesses before Fudge to prove Sirius's
innocence and Pettigrew's treason? In fact, why couldn't DD use it on
Harry in GoF to prove as an eye witness account that Moldy Voldy was back?

As for the idea that the piensive is subjective or objective, please
read the article from mugglenet about the piensive.

http://www.mugglenet.com/editorials/thenorthtower/nt17.shtml 

This has been bothering me for some time.
Sawsan