the thing is, nobody can tell. eventhough opiod was permitted to be administered back then to certain patients, it was pretty much unknown til you hear the words "CODE BLUE". it had become too prevalent that I'm not sure if Opiod finally gotten banned here (not sure though since I stopped working there for a long time). basically, Code Blue became synonymous to Opiod OD. it's difficult and kinda sad and infuriating at times since administering Opiod and Narcan became a hand in hand thing. like killing/dying and saving/resuscitating kind of scenario everytime. not to mention that Narcan costs a lot here unlike in your territory where it could be affordable. not saying you don't need it or at fault. but some are just there to get high. just saying that it can take a toll to some health care workers mental health as well. on the otherhand, it's not as bad compared to Covid patients.
From my experience, people can definitely tell you're high on something if they know you. It's the difference in speech that always tips them off.
In my country, we've only had our "Opium Law" since 2014, which made all opioids require a prescription. Before 2014 you could just buy codeine etc without a prescription.
Over here we don't really have a massive opioid crisis to the extent the US has. I've never known anyone who has been prescribed an opioid stronger than Tramadol. Whereas in the US, doctors seem to hand out Oxycodone, hydrocodone, ... for things like wisdom teeth removal.
A hospital in particular here will never ever prescribe anything stronger than Tramadol when you're released from the hospital after a surgery. They'll pump you full of morphine etc while you're there to ease your pain as much as possible but it's a common hospital policy to not provide a painkiller prescription for patients released from the hospital after surgery unless the patient
really insists, but even then it won't be anything stronger than a short supply of the lowest dosage of Tramadol.
For my chronic pain condition, doctors made me try just about every possible non-opioid form of painkillers before very reluctantly prescribing me Tramadol.
For reference, Tramadol is a bit stronger than Codeine but nowhere near the likes of Oxycontin.