Consultants have held several strikes over the past year, which has hobbled the NHS as it tries to grapple with financial constraints and backlogs caused by the coronavirus pandemic.
Health officials say they analyzed a number of white triangular pills with rounded corners that resemble eight-milligram hydromorphone pills that are sold under the brand name Dilaudid.
After warning of delays earlier in the day at diagnostic services and some blood labs, UHN now says those delays could continue as staff work to clear the backlog.
Last week, Public Safety Minister Kris Austin said the idea behind the bill is to force people with severe drug addiction into treatment if they are not in a mental state to make that decision voluntarily.