Ok, so I want to frame someone for a murder and get the pre-cogs to predict it.
So I get a stooge to pretend he has murdered my victim's son, knowing full-well that he will murder him when he finds out. (The stooge's family will get a huge pay-off.) I stick him in a hotel room with loads of photo "evidence" of his supposed crime.
Why would my victim actually go to the room?
I'm pretty sure that in the movie, John Anderton only goes to the room because the pre-cogs have predicted that he would murder someone there. But, unless they predicted it, it would never have happened.
And anyway, how did the authorities know that the pre-cogs would actually predict the murder?