The Governement is to introduce new laws within a fortnight that will give police new powers to administer a blood test on drivers thought to be driving under the influence of drugs.

The move comes after National rode to the rescue of Labour on the proposed new laws, which had been stymied by disagreement by New Zealand First and the Greens over the legislation.

"National would support any sensible measures that would stop people driving while impaired by anything," said National transport spokesman Maurice Williamson.

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