Dr. Tracey McIntosh from the University of Auckland defining noramative and deviant behaviour.

The crown prosecution put it to him that watching hardcore pornography was also a trigger in his deviant behaviour.

He told the court ice was a "sexual drug" and his deviant behaviour and meth abuse went "hand-in-hand".

Sir, - The language in which we describe crime and deviant behaviour has important implications for how we respond to it.

The court heard how he believed ice was a "sexual drug" and his deviant behaviour and meth abuse went "hand-in-hand".

If I'm a successful warden and I do my job and we correct the deviant behaviour, then we should have a parole hearing.

But the murders had not come from nowhere, and followed sex crimes which had escalated out of deviant behaviour beginning in his early teens.

The President of South Africa, Jacob Zuma has chastised the Zimbabwean government for" deviant behaviour", as he begins his first state visit to the country.