The Law Association is urging caution and restraint on all sides over the one shot one kill policy.
In a statement, the council of the Law Association says the top is "correct in asserting the right of police officers to use deadly force in self-defence when fired upon.
The association adds a police officer who is about to be attacked does not have to wait for the suspect to strike the first blow of shot.
But it says the use of deadly force must always be proportionate to the threat posed to the police officer.
It is also cautioning the top cop about the need to balance the law and how he is responding to critics of his policy.