The executive director and registrar for the CNO took the inquiry's stand on Tuesday.

The inquiry was also shown a toxicology menu, which is filled out at an autopsy. Testing for insulin – which serial killer Elizabeth Wettlaufer used to kill eight patients in her care – does not fall into any of the menu items.

A nurse who described himself as evil was convicted Monday of using insulin to murder two patients at a British hospital in 2011.