The Government has been urged to introduce random roadside drug testing immediately. But New Zealand researchers who are working on an innovative drug test say the equivalent of a booze bus for drugs is a long way off.

New Zealand scientists are developing a test which could quickly detect whether a motorist has been using methamphetamine.

It is hoped that the testing method being devised by the Institute of Environmental Science and Research (ESR) and a New Zealand biotech company could eventually be used for roadside testing and cover other drugs including cannabis and synthetic cannabis.

But as advocates and

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