Amanda Douglas on cannabis legalisation and drug testing I understand that, in Australia, there is road side testing for drugs, involving a screening oral swab and then, if 'positive', a further oral fluid test (similar I understand to what oral screening in NZ would move to). There are also subjective "walk along the line' type tests and pupil dilation, which can be used but, if the Bill passes, more work might be done on that. Any of that could be drawn on in the workplace, as appropriate.