Some judges have expressed the opinion that mandatory minimum sentencing, especially in relation to alcohol-fueled violence, is not effective. In "R v O’Connor", the High Court of Australia gave the opinion that when an offender is intoxicated, there will likely be a change in their personality and behaviour, which will then affect their self-control; that, while an offender may commit an act which is voluntary and intentional, it is not something that they would have done in a sober state. Intoxication is not a justification for criminal behaviour, nor (in most jurisdictions in the U.S. and Commonwealth) a legal defence; but since an intoxicated person's decisions are less likely to be shaped by rational assessment of consequences than those of a sober person, deterrence is likely to be less effective for intoxicated people.