Meth driving

How hard is it for a Police officer to determine whether a driver might be off their trolley because of methamphetamine abuse?  Some might say that if you see it often enough, you recognise the signs.
How hard is it for a forensic toxicologist to reconcile different driving behaviours as being attributable to meth use?  Possibly very difficult, if no blood sample is taken.  However, New Zealand’s law now allows for a blood sample to be collected from drivers suspected of driving whilst impaired through drugs (see previous posts: Drug driving and impairment testing, Roadside impairment tests; drug driving, Don’t accept the forensic science at face value).  Which is just as well, given the enormous variation in behaviours that can be exhibited by meth users.
I would expect most people in NZ would think that a driver who was on P (pure methamphetamine) would be tanking down the motorway at 150 kph with the Police in hot pursuit, as per last year’s events involving the accidental death of a courier driver who was caught in the cross-fire between Police and an armed driver. However, an article in last month’s Science & Justice shows just how varied the effects of P can be.
The article’s author, Nikolas Lemos*, writes of two separate cases involving drivers being stopped by Police.
The first case involved a relatively placid, co-operative man who drove somewhat erratically but was slow (only about 30 miles an hour) and was tail-gating the car in front. Police asked him to stop and he did.
The second case involved the Police in a high-speed car chase with a driver and a stolen sports utility vehicle. After racing along roads at speeds in excess of 100 miles an hour, the driver then leapt from the moving vehicle, leaving a female passenger to crash, along with the vehicle, into police cars. Police chased the driver and tried, unsuccessfully, to subdue him with a conductive energy weapon (which I assume means a Taser). After being Tasered (is that a real word?) another two times, he was dragged kicking and screaming into custody.
Two more dissimilar descriptions of P users you couldn’t imagine but the blood methamphetamine concentrations of both drivers were comparable as were their heights and weights. Just goes to show just how unpredictable P can be.

* As the article is behind a subscription wall, the full reference is: Lemos, N. 2009. Methamphetamine and driving. Science & Justice, 49(4), 247-249.  Abstract: Methamphetamine incidence in driving under the influence cases in the City and County of San Francisco is a significant and on-going challenge.  Two methamphetamine positive driving cases are presented herein demonstrating some similarities in observed signs and symptoms and drug blood concentrations but which are also characterised by very different driving styles and behaviours towards the police officers when encountered on the road.

The article also discusses other issues such as the field impairment tests and analytical results.

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