القاعدة ذات الصلة
Canada
Practice Relating to Rule 10. Civilian Objects’ Loss of Protection from Attack
Canada’s LOAC Manual (1999) states: “Where a civilian object is used for military purposes, it loses its protection as a civilian object and may become a legitimate target.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-5, § 37.
The manual further states: “Civilian vessels, aircraft, vehicles and buildings are military objectives if they contain combatants, military equipment or supplies.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-2, § 10.
Canada’s LOAC Manual (2001) states in its chapter on targeting:
407. Examples of objects which are military objectives
2. Civilian vessels, aircraft, vehicles and buildings are military objectives if they contain combatants, military equipment or supplies.
428. Civilian object used for military purposes
1. Where a civilian object is used for military purposes, it loses its protection as a civilian object and may become a legitimate target. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, §§ 407.2 and 428.1.
Canada’s LOAC Manual (1999) states:
In the case of doubt as to whether an object which is normally dedicated to civilian purposes (such as a place of worship, a house or other dwelling, or a school) is being used to make an effective contribution to military action, it shall be presumed not to be so used. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 4-5, § 38.
Canada’s LOAC Manual (2001) states in its chapter on targeting:
In the case of doubt as to whether an object which is normally dedicated to civilian purposes (such as a place of worship, a house or other dwelling, or a school) is being used to make an effective contribution to military action, it shall be presumed not to be so used. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 429.
Canada’s Use of Force Manual (2008), in a section entitled “Principles and rules governing the use of force that directly relates to the conduct of armed conflict”, states:
Doubt rule. A person or object must not be attacked unless there is a reasonable belief that the person or object to be attacked is a military objective. In cases of doubt, a person is presumed to be a civilian, and the use of an object normally dedicated to civilian purposes is presumed to be of a nature other than that constituting an effective contribution to military action, unless and until the contrary is established. 
Canada, Use of Force for CF Operations, Canadian Forces Joint Publication, Chief of the Defence Staff, B-GJ-005-501/FP-001, August 2008, § 112.3.