Yes dmcg , and I think, it would be perfectly proper to decline those "duties" while still remaining in the employment that did not require "mercy killing"when the medic was trained and then employed. Of course this is the situation with the marriage clerks who in all good conscience could not put their name to registering same sex "marriage".   You have a point about not entering a profession where you know you would have to offend your conscience to fulfil your contract.