What type of sample is mandatory after collisions to confirm intoxication?

In the context of confirming intoxication after collisions, a blood sample is mandatory primarily due to its accuracy and reliability in measuring blood alcohol concentration (BAC) and the presence of drugs. In New South Wales, law enforcement recognizes that blood tests provide definitive evidence of intoxication. This is particularly important in collision cases, where the severity of injury or damage often necessitates clear and objective proof of an individual's impairment.

Breath samples are commonly used for roadside testing; however, they are not always deemed sufficient for legal proceedings, especially in serious incidents. While saliva and urine tests can indicate the presence of substances, they are typically not the primary method employed in post-collision scenarios. A blood sample's precision in quantifying alcohol and drugs makes it the preferred choice for confirming intoxication levels conclusively after an accident.