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Since the introduction of Sarah's Law into the Thames Valley six months ago, police have told Heart's it's helping them find sex offenders.
From the 65 applications they've recieved since August, two have been revealed as having previous convictions relating to child sex offences.
Detective Inspector Nick Deacon from Thames Valley Police says one of them was from a concerned dad who was worried about his son's teacher. He contacted the police and from his applications they were able to tell him his concerns were justified. The father of the boy has since removed all contact with him.
The number of applications has steadily fallen since August with just 5 made in January 2011 compared to 26 in the first month. But police say they still want people to get in touch even if they are slightly concerned.