Based on the film/book: if you could 99.9% accurately see when and how a murder was going to be committed before it was actually committed - should you be able to charge that person with attempted murder, provided you stop them before the act is committed.
In theory - they haven't attempted the murder, but you know that if you don't stop them, they will commit murder.
So how do you go about it? Let them committ the murder & then be able to charge them with murder?
In theory - they haven't attempted the murder, but you know that if you don't stop them, they will commit murder.
So how do you go about it? Let them committ the murder & then be able to charge them with murder?