They don't make drug tests like they used to. When the drug driving legislation becomes law in December, police will again be empowered to require suspects to walk in a straight line and turn on the spot without falling over. They will also be required to flash a torch in a suspected drug user's eyes.

This testing regime is called a Compulsory Impairment Test.
Tauranga traffic senior sergeant Ian Campion says the tests sound much like those used when breathalyzers first became available.
'Under this legislation, a police officer who suspects a driver of being impaired can require the driver to carry out a Compulsory Impairment Test. A driver who does not satisfactorily complete this test will be required to provide a blood specimen,” says Transport Minister Steven Joyce.
The Compulsory Impairment Test was developed in conjunction with experts in the United Kingdom, specifically for detecting drug impairment.
Police are expected to be trained in administering the test before the drug driving legislation becomes law. It will be part of the preliminary testing to determine whether or not a breath test would be administered.
'This legislation makes it easier to gather evidence and get convictions. Penalties will be the same as for drink driving,” says Steven.
It is already an offence under the Land Transport Act to drive while incapable of proper control, due to alcohol or drugs. But the existing offence can be difficult to enforce.
The new law makes it easier for police to show whether a driver presents a road safety risk or not.
If the blood test finds the presence of a controlled drug or prescription medicine, the person may be charged with the new offence of driving while impaired. The penalties for this new offence are aligned with the penalties for drink driving.
The law comes into effect on December 1.