There is no such thing as zero diversion. When methadone programs first started in the early nineties, protocols were set in place to minimize that diversion, which required patients who were just recently initiated on methadone to attend the pharmacy every day and consume a witnessed dose of methadone. They weren't able to take any doses of their methadone home until they had achieved evidence of significant stability. That usually required a period of over three months.
After three months of a patient's denying use of substances, substantiated by witnessed negative drug screens, in which the patient had to produce a urine sample under witness conditions, if those twice-weekly urine samples remained negative over a period of three months, then a patient would be able to take one dose of methadone home a week, and after a month that increased to two. It would take six months—nine months really—to get all of their take-home doses, otherwise known as “carries”. Even that didn't prevent diversion, but it certainly reduced it.
Compare that with what is happening in safe supply clinics, particularly in London. You could go to a clinic in London and say that you had a problem with opioids. Chances are significant that you would walk out of that doctor's office with a prescription for Dilaudid—enough to last a whole week. You might have to have one witnessed dose in front of the pharmacist, and you would get the rest of your doses to take home. If it didn't happen immediately, it would happen certainly after about two or three weeks that you would be getting maybe 50 or 60 tablets to take home. That's far more than a patient who has just had abdominal surgery would require for the management of their pain. That is just tantamount to negligence. It's just incomprehensible. It's unconscionable that someone who is active in their disease of addiction would be trusted to take that amount of an opioid home.