Drivers often assume drug driving and drink driving work the same way in law. They do not. Both are major traffic offences carrying licence disqualification and fines, but they rest on different legal frameworks, use different testing methods, and open different defences. If you have been charged, the distinction matters.
Drink driving is detected by a roadside breath test, then confirmed on a calibrated breath analysis machine at a police station. These machines measure the concentration of alcohol in your breath.
Drug driving is detected through Mobile Drug Testing. Police take a saliva swab and test for specific illicit substances: THC, the active component in cannabis; methamphetamine; and MDMA. Cocaine is sometimes tested as well. A positive roadside swab prompts a second swab, and if that is also positive the sample goes to a laboratory for analysis. You are generally not formally charged until the laboratory confirms the result, which can take weeks. Clients are frequently caught off guard by a court attendance notice arriving well after they had assumed the matter had gone away.
The most significant legal difference between the two offences is the distinction between impairment and presence.
With drink driving, the law sets a legal limit, typically under 0.05 for full licence holders. You are punished according to how far over that limit you are, on the assumption that at a certain concentration your driving is impaired.
NSW drug driving laws work differently. The offence of driving with the presence of an illicit drug operates on strict zero tolerance. The law does not ask how much of the drug is in your system, and police do not have to prove your driving was impaired. If the laboratory detects a trace of THC from cannabis consumed days earlier, the offence is made out. Many drivers are charged while feeling completely sober.
Penalties for both offences are severe, but they escalate differently. High-range drink driving carries mandatory interlock device orders, large fines, and a real prospect of a prison sentence or a strict community corrections order.
The standard drug driving charge, presence of a drug, generally carries a lower maximum penalty than high-range drink driving. It still results in automatic licence disqualification and a criminal record. If police believe your driving was actively impaired by drugs, they can instead charge you with Driving Under the Influence of a Drug. That is a substantially more serious charge, carrying penalties identical to high-range drink driving.
The two charges call for different strategies. Drink driving defences often focus on the accuracy of the breathalyser or the timing of the test. Drug driving defences may involve an honest and reasonable mistake of fact, such as unknowingly consuming a spiked substance, though that is difficult to establish.
For both offences, the most common strategy on a guilty plea is to seek a non-conviction order by putting compelling subjective material before the Judge. If you have been caught by these laws, contact our drug driving defence lawyers to discuss your options.
