The following are impairment matters:

• a registered teacher is affected by use of or dependence on alcohol or a drug to such an extent that their ability to practise as a teacher is or is likely to be affected
• a registered teacher suffers from an impairment to such an extent that their ability to practise as a teacher is or is likely to be affected.

The word 'impairment' is defined to mean

• mental disability
• injury
• physical illness.