British police targeting wouldbe criminals before they offend

British criminal psychologists are putting together a list of the 100 most dangerous murderers and rapists before they have committed any such crimes, The Times said.

Sounds like something from Minority Report.

What do the people of the vine think about arresting people before they have committed a crime?

What if this method had only a 1% error rate?

How could they even prove that at all?