Not Guilty of Drug Driving Despite Cannabis in System


By Paul Gregoire and Ugur Nedim

Northern Rivers region resident Joseph Carrall was pulled over by NSW police senior constable Chayne Foster on 23 June 2015 for a random drug test.

The officer asked the driver whether he’d taken any illicit drugs within the last 48 hours, which Mr Carrall replied, “I had a smoke over a week ago.”

Officer Foster took a sample of saliva, which tested positive for the presence of THC: the psychoactive component of cannabis. Mr Carrall was then arrested and taken to the police station to be tested again. He remarked, “I thought I would be alright. It was over a week ago.”

At the station, Carrall’s second test showed traces of cannabis, while a third sample sent to the forensic unit tested positive as well.

Mr Carrall was in familiar territory. A month earlier, on 26 May, officer Foster had pulled him over and recorded a positive test then as well.

The mere presence

Mr Carrall appeared in Lismore Local Court in January last year charged on two counts of drug driving, under section 111 of the Road Transport Act 2013, which provides that a person must not drive a motor vehicle while an illicit drug is “present” in their “oral fluid, blood or urine.”

Carrall pleaded guilty to the first charge in respect of the earlier incident, and not guilty to the latter.

A drug driving conviction carries a maximum penalty of a $1,100 fine for a first offence, and a fine of up to $2,200 for a second or subsequent offence. A conviction can also lead to an individual’s licence being disqualified for six months.

This offence, which makes it a crime to drive with the mere presence of a substance in a person’s system, was introduced via the Road Transport Legislation Amendment (Drug Testing) Act 2006. The Act also established the legal framework for NSW police to begin their mobile drug testing (MDT) operations.

They’re not testing for impairment

There is a different offence for driving under the influence of alcohol or other drugs under section 112 of the Road Transport Act. This law is invoked when drivers are charged with drink driving.

Unlike MDT, random breath testing determines whether an individual is driving with dangerous levels of alcohol in their system. The Dräger devices currently used in MDT operations test for only the presence of three substances: THC, MDMA and amphetamines.

In October 2015, NSW Greens MLC David Shoebridge obtained police standard operating procedure manuals, which confirmed that officers are actually testing for minute traces of these specific substances.

“MDTs should be testing for impairment, not merely the presence of drugs, so it’s time we moved towards testing for all drugs – legal and illegal – that impair drivers and actually ensure road safety,” Mr Shoebridge told Sydney Criminal Lawyers last week.

The advice of police

Mr Carrall testified in court that when he was arrested the first time, officer Foster advised him, “If you had waited a week, you would have been fine.” Carrall added that he relied on this advice before driving again after having smoked cannabis. He gave evidence that the last time he had smoked cannabis was nine days prior to his second arrest.

The defendant admitted that during the period between smoking and being pulled over over, he had been at a house where a man had smoked a joint in another room. But Carrall said he believed that this potential passive smoking episode wouldn’t have affected him. And at the time of the arrest, he was convinced that he was fine to drive.

In giving evidence, senior constable Foster said it was unlikely he told Mr Carrall to wait a week before driving after smoking marijuana, as it would be encouraging offending. But he admitted he couldn’t remember.

The officer further testified that he believed the MDT devices police use can detect cannabis in a person’s system for up to three to four days after they’ve used it. The officer also said, “Now you could be a smoker and not drive, or a driver and not smoke, and that was the effect of the new laws.”

An ‘honest and reasonable mistake’

Magistrate David Heilpern said that Mr Carrall’s “clear and unambiguous evidence” under cross-examination had led him to believe the defendant’s version of events. He accepted he’d been advised to wait for a week, and that he had smoked the marijuana nine days prior to his arrest, and at no time thereafter.

His Honour pointed out that it was obvious from the reading speeches made by the ministers who introduced the original legislation into parliament that the law was designed to be used for drugs that were “active” in a person’s system, and would therefore impair their driving.

The magistrate ultimately had to decide whether Mr Carrall had made an ‘honest and reasonable mistake’of fact – which is a defence to ‘strict liability’ offences such as drug driving and drink driving.

Prosecuting lawyer Mr Huxtable argued that he hadn’t, because all drivers should be well aware of a law such as driving with an illicit substance and Carrall should have known he may have had cannabis in his system.

His Honour disagreed, finding that the combination of the police officer’s previous advice and the evidence that Mr Carrall had smoked nine days earlier earlier, and not thereafter, was sufficient to ground an honest and reasonable mistake.

“the defendant honestly believed that the cannabis was no longer present”, the magistrate concluded.

He therefore found the defendant not guilty of the second charge.

Charges based on ‘minute quantities’ overwhelming the courts

Back in 2015, the NSW government announced it was tripling its MDT operations to 97,000 tests a year by 2017. A main focal point of this blitz has been the Northern Rivers region. The conviction rate in that area was five times the state average over the 24 month period ending in June last year.

Lismore Court has been overwhelmed with drug driving cases. Magistrate Heilpern said the court deals with about 50 a week that involve people who claim to have tested positive due to passive smoking. He said people “have plead guilty even though they are not cannabis users themselves.”

Many locals are losing their licences, which has a devastating effect on the lives of people living in regional areas. The magistrate stressed that licence “disqualification is a serious and significant punishment.”


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