After coming back from his duel with Voldemort, Harry was scorned at by Cornelius Fudge. There are 2 questions here:
I'm talking about Barty Crouch Jr.'s confession in point 1
Why didn't Harry, Snape, McGonagall or Dumbledore extract their memory of the event? I know memories can be tampered with, so that Fudge might have used that as an excuse if one of the 4 mentioned extracted it, but 4 separate, identical memories would be much harder to tamper with and keep identical, wouldn't they? Especially as Harry probably has no idea on how to tamper with memories.
Why didn't Harry extract the memory of what happened at the Graveyard with Voldemort? It would give Dumbledore much more insight and knowledge into what happened, instead of going off of Harry's account of it? I don't think the magic to extract a memory would have been hard either, seeing all the difficult magic Harry has done previously.