Related Rule
Canada
Practice Relating to Rule 126. Visits to Persons Deprived of Their Liberty
Canada’s Use of Force Manual (2008) states:
Chapter 4: Use of Force in International Operations
402. Types of International Operations
1. In general, there are four types of international operational relationships in which the CF [Canadian Forces] may participate with each one having unique considerations pertaining to the use of force, self-defence and rules of engagement:
a. Alliance. Alliance operations refer to operations conducted under a formal standing alliance such as the North Atlantic Treaty Organization (NATO) or Canada-United States (CANUS). In these cases, there are formal policy, command-and-control and force structure instruments which will affect ROE [rules of engagement] development and application;
b. Coalition. A coalition is a less formal alliance which is normally limited to a specific mission. Coalitions normally lack the formal status of forces' agreements and infrastructure architectures that are common to alliances such as NATO. A coalition may operate under the legal umbrella of a UN Security Council resolution, but they are not UN missions. Once a mission or operation has been completed, the coalition is normally disbanded;
c. United Nations (UN). UN missions operate under a UN Security Council resolution and fall within the UN command-and-control structure; and
d. Unilateral. An international operation where Canadian forces are operating unilaterally within a region or area.
407. Supplementary Direction
3. Detainees. In support of the operational or security objectives of an international operation, Canadian forces may be required to detain persons. Reasons to detain include, but are not limited to, persons who do the following:
a. interfere with the accomplishment of the mission and related tasks;
b. otherwise use or threaten force against friendly forces, or the equipment and materials belonging to them, or under their protection;
c. enter an area under the control of friendly forces without prior authorization; and
d. are suspected of breaches of the law of armed conflict.
4. Where the use of deadly force is authorized in a given situation, that authority also includes the authority to detain persons against whom deadly force could have been used. In all other cases, specific ROE must be authorized in order to detain persons. The standards provided in the Geneva Conventions will be the minimum standard for the treatment of all detainees whether or not the Geneva Conventions legally apply during the operation. 
Canada, Use of Force for CF Operations, Canadian Forces Joint Publication, Chief of the Defence Staff, B-GJ-005-501/FP-001, August 2008, §§ 402.1 and 407.3–4.