The odds of ransom being paid without criminal capture are also low.

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Justice officials also described criminal fraud issues as relatively low.

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When parking was a criminal matter it was of a low priority and so went unpoliced.

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Those who have been released are non-criminals or low-risk offenders without serious criminal histories, ICE spokeswoman Barbara Gonzalez said.

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The report notes the concern of some neuroscientists that the current age of criminal responsibility in the UK is set too low.

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It did not preclude criminal prosecutions against those who, thinking they could lie low and hope for the best, failed to come forward voluntarily to confess.

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Advances in neuroscience suggest the age of criminal responsibility - 10 in England, Wales and Northern Ireland - might be too low, according to a study.

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Low self-confidence and self esteem may mean they are more susceptible to drug and alcohol use and criminal activities.

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