This article is from the Lawful Arrest/Search/Seizure FAQ, by Ahimsa Dhamapada email@example.com with numerous contributions by others.
This is exactly what we should expect!
If the government acts BEFORE there is a crime,
this is known as "Prior Restraint", or "Restraint Before
Injury", which the Supreme Court has decided (in many
decisions regarding free speech and free assembly) to
Even the police know this! Often times when called to a
scene, perhaps a domestic dispute, they will refuse to take
a person into custody until that person commits a crime
Besides, how can the police *know* that a crime *will*
occur (in the future)? Are they clairvoyant? Do they have
crystal balls and know the future? Certainly not.
The role of the police as agents of "Crime Prevention"
is a myth. It may be a reasonable goal for Superman with
his super powers; but when mortal men try it, they *always*
violate the rights of innocent people.