For now, if Police suspect you’re impaired, they will use what’s called a compulsory impairment test. If you fail that, you’ll be required to take a blood test to check whether you have any ‘qualifying drugs’ in your blood above certain ‘threshold’ or ‘high-risk’ levels.
The list of drugs includes the likes of MDMA, cannabis, methamphetamine, cocaine and ketamine, as well as prescription medicines like tramadol, lorazepam and codeine.