Eleven troubled Christchurch teens are being tailed at school by government-funded minders because of concerns about their aggressive and sexually inappropriate behaviour.

The minders are paid by Child, Youth and Family (CYF) to accompany the students to school each day, sit next to them in class and follow them around the playground to ensure that they do not behave in ways which could have them expelled.

Most of the eight boys and five girls with minders are living in CYF care; some are completing rehabilitation programmes for juvenile sex abusers.

Attrill said trackers were not trained social workers, and were employed on a casual basis, after undergoing a police check, for an average hourly rate of $15.