Dozens of children in Essex have been kept safe from sex offenders since the murder of Sarah Payne.
The eight-year-old was killed by a known sex offender in 2000.
Following her death a successful campaign was launched to give people controlled access to the sex offenders’ register to try and avoid paedophiles having access to children.
It is called Sarah’s Law - or the child sex offender disclosure scheme.
In the past three years 181 applications have been made to Essex Police to ask whether someone who has contact with a child is a sex offender.
In total, 31 disclosures have been made.
Det Chief Insp Paul Johnson said: “The idea is people come to us if they think there is a danger.
“We can’t see everything and can’t always see what sex offenders are doing, although we do monitor them closely.
“If there is a risk we can disclose it.”
About one in six requests uncovers a risk.