"6.4 Some sentences can only be imposed on children and young people if they are deemed a persistent offender. A child or young person must be classed as such for one of the following to be imposed… a detention and training order (DTO) when aged 12 – 14. 6.5 The term 'persistent offender' is not defined in statute but has been considered by the Court of Appeal. In general it is expected that the child or young person would have had previous contact with authority as a result of criminal behaviour. This includes previous findings of guilt as well as admissions of guilt such as restorative justice disposals and conditional cautions. … 6.8 When a child or young person is being sentenced in a single appearance for a series of separate, comparable offences committed over a short space of time then the court could justifiably consider the child or young person to be a persistent offender, despite the fact that there may be no previous findings of guilt. In these cases the court should consider whether the child or young person has had prior opportunity to address their offending behaviour before imposing one of the optional sentences available for persistent offenders only; if the court determines that the child or young person has not had an opportunity to address their behaviour and believes that an alternative sentence has a reasonable prospect of preventing re-offending then this alternative sentence should be imposed. … 6.10 Even where a child or young person is found to be a persistent offender, a court is not obliged to impose one of the optional sentences. The approach should still be individualistic and all other considerations still apply. Custodial sentences must be a last resort for all children and young people and there is an expectation that they will be particularly rare for children and young people aged 14 or under."