One in three criminals are prolific offenders with more than 15 convictions – and the number is rising

100,000 'hard core' criminals have at least 15 convictions – and the number is rising Ministry of Justice figures show worrying rise in hardened criminalsConvictions for serious and more minor offences see riseAverage prison sentence length jumps dramatically in 10 yearsPrison expert says public is at risk from repeat offenders By Jack Doyle PUBLISHED: 17:39 GMT, 21 February 2013 | UPDATED: 00:52 GMT, 22 February 2013 Hardened: Ministry of Justice figures show a worrying rise in repeat offenders. The number of criminals with 15 or more previous convictions or cautions is now one in three