The human rights group Liberty has reacted to the Court of Appeal judgement by calling on the Government to introduce a more nuanced CRB system.
It says "irrelevant and unreliable information has blighted lives for too long."
The Home Office says it's "disappointed" by the judgement and is seeking leave to appeal to the Supreme Court. "The protection of children and vulnerable groups must not be compromised."
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Christopher Kerr murdered 15-year-old Michael McIlveen in 2006.
Police warned people not to approach the 32-year-old if they spotted him.
A witness said that the animals may have been spooked by the sound of a horn.