Wellington, July 23 NZPA - The Transport Ministry is looking into loopholes that allow some drink driving offenders to return to driving without treatment for alcohol addiction and could report back as early as next week.

Convicted drink-drivers given an indefinite licence suspension can apply to have their licences returned after a year and a day - but have to undergo an alcohol and drug assessment and liver tests. If they fail, they must complete treatment.

However, a New Zealand Transport Agency spokesman confirmed to The Dominion Post no assessment was needed for people who had completed disqualifications for a specified period - a sentence which is still often applied to those guilty of more serious offending.

A spokeswoman for Transport Minister Steven Joyce told NZPA he had asked the ministry to look into the situation urgently.

Mr Joyce only became aware of the situation yesterday.

There was already a review into strengthening penalties for drivers who were involved in a crash that caused serious injury or death.

However, that review did not extend to licence suspension for drink drivers.

Rather than delay the current review Mr Joyce has asked for the matter to be looked at separately, the spokeswoman said.

A initial report was expected next week.