Certainly every chaplain has resolved in his or her mind that when the chips are down, a chaplain may have to take action and become involved in a situation when the officer needs assistance. But there should be clear roles that a chaplain is not to interfere with a call in any way unless so requested by the officer. Most law enforcement chaplains have uniforms, badges and carry much of the same equipment as a regular officer. But some chaplains, who have not received formal police training and are not commissioned officers, step over the line into the officer's role. This in no way says that a chaplain can not or should not participate in special roles for which he has been trained.
Examples are family violence, crisis negotiation.
Even traffic control or similar duties where an officer can be freed to tend to law enforcement business. But the chaplain must pay his dues. This involves going to the police academy or some other approved means of training. Then the chaplain takes the state exam just like all other officers. Before a chaplain undertakes this course of action, he or she will want to discuss it with the Chief or Sheriff to make sure it meets with their approval.