There are different opinions on Sarah's Law.
Some people think it would work as parents would know to keep their children away from people who are known to hurt children.
But others think it would force dangerous people to hide away and be secret, and they may not get the counselling which could stop them hurting children again.
People are also worried that those who are known to hurt children would be attacked by the public, and no one would want to live near them.
For these reasons, the British Government has decided it doesn't want to introduce a Sarah's Law.