Related Rule
Canada
Practice Relating to Rule 80. Booby-Traps
Canada’s Rules of Engagement for Operation Deliverance (1992) states: “Unattended means of force, including booby traps … are not authorised.” 
Canada, Canadian Joint Force Somalia: Rules of Engagement Operation Deliverance, completed on 11 December 1992, reprinted in James M. Simpson, Law Applicable to Canadian Forces in Somalia 1992/93. A study prepared for the Commission of Inquiry into the Deployment of Canadian Forces to Somalia, Minister of Public Works and Government Services, Ottawa, 1997, Appendix, pp. 73–80, § 28.
Canada’s LOAC Manual (1999) states: “Explosive booby-traps are not to be employed as, or used as, a substitute for antipersonnel mines. Where booby-traps are lawfully used, they must not cause unnecessary injury or suffering.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-4, § 40.
The manual provides an exhaustive list of prohibited objects to which booby-traps must not be attached. It states:
Booby traps and other devices, attached to or associated with the following objects, are prohibited:
(a) internationally recognized protective emblems and signs;
(b) sick, wounded or dead persons;
(d) burial or cremation sites or graves;
(d) medical facilities, equipment, supplies or transportation;
(e) children’s toys or objects designed for feeding, health, hygiene, clothing or education of children;
(f) food or drink;
(g) kitchen utensils or appliances (except those in military establishment, locations or supply depots);
(h) objects of a religious nature;
(i) historic monuments, works of art or places of worship which constitute the cultural or spiritual heritage of peoples; or
(j) animals or their carcasses. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-4, § 38.
The manual adds: “It is prohibited to use booby-traps … in the form of apparently harmless portable objects which are specifically designed and construed to contain explosive material.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-4, § 39.
The manual also lists some restrictive rules about the use of booby-traps:
All feasible precautions must be taken to protect civilians from the effects of … booby traps. They must not be directed at civilians nor may they be used indiscriminately. It is indiscriminate to:
(a) place … booby traps so that they are not on or not directed at a legitimate target;
(b) use a means of delivery for … booby traps that cannot be directed at a legitimate target; and
(c) place … booby traps so that they may be expected to cause collateral civilian damage that is excessive in relation to the concrete and direct military advantage anticipated. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-5, § 44.
The manual further states:
Booby traps … must not be used in areas containing civilian concentrations if combat between ground forces is neither imminent nor actually taking place unless: (a) they are placed on, or in the vicinity of, an enemy military objective; or (b) measures are taken to protect civilians (e.g. warning signs, sentries, fences or other warnings to civilians). 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-5, § 45.
According to the manual: “The location of … areas in which there has been large scale and pre-planned use of booby traps must be recorded. A record should also be kept of all other … booby traps so that they may be disarmed when they are no longer required.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-5, § 46.
Lastly, the manual states:
It is prohibited to use … booby traps that employ a mechanism or device specifically designed to detonate the munition by the presence of commonly available mine detectors as a result of their magnetic or other non-contact influence during normal use in detection operations. 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 5-5, § 47.
Canada’s Code of Conduct (2001) provides: “Booby traps are lawful but can only be used in very limited circumstances, and in particular must be directed only at military objectives.” 
Canada, Code of Conduct for CF Personnel, Office of the Judge Advocate General, 4 June 2001, Rule 3, § 7.
Canada’s LOAC Manual (2001), in its chapter entitled “Restrictions on the use of weapons”, provides constraints on the use of booby-traps and other devices:
1. A “booby trap” is any device or material which is designed, constructed or adapted to kill or injure, and which functions unexpectedly when a person disturbs or approaches an apparently harmless object or performs an apparently safe act. “Other Devices” means manually placed munitions and devices including improvised explosive devices designed to kill, injure or damage and which are activated manually, by remote control or automatically after a lapse of time.
2. Booby traps and other devices, attached to or associated with the following objects, are prohibited:
a. internationally recognized protective emblems and signs;
b. sick, wounded or dead persons;
c. burial or cremation sites or graves;
d. medical facilities, equipment, supplies or transportation;
e. children’s toys or objects designed for feeding, health, hygiene, clothing or education of children;
f. food or drink;
g. kitchen utensils or appliances (except those in military establishments, locations or supply depots);
h. objects of a religious nature;
i. historic monuments, works of art or places of worship which constitute the cultural or spiritual heritage of peoples; or
j. animals or their carcasses.
3. It is prohibited to use booby trap[s] or other devices in the form of apparently harmless portable object[s] which are specifically designed and constructed to contain explosive material.
4. Explosive booby traps are not to be employed or used as a substitute for anti-personnel mines. Where booby traps are lawfully used, they must not cause unnecessary injury or suffering. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 522.
The manual further states with regard to the authorized use of booby-traps:
4. All feasible precautions must be taken to protect civilians from the effects of … booby traps and similar devices. They must not be directed at civilians nor may they be used indiscriminately. It is indiscriminate to:
a. place … booby traps so that they are not on or not directed at a legitimate target;
b. use a means of delivery for … booby traps that cannot be directed at a legitimate target; and
c. place … booby traps so that they may be expected to cause collateral civilian damage that is excessive in relation to the concrete and direct military advantage anticipated.
5. Booby traps and similar devices must not be used in areas containing civilian concentrations if combat between ground forces is neither imminent nor actually taking place unless:
a. they are placed on, or in the vicinity of, an enemy military objective; or
b. measures are taken to protect civilians (for example, warning signs, sentries, fences or other warnings to civilians).
6. The location of all … areas in which there has been large scale and pre-planned use of booby traps must be recorded. A record should also be kept of all other … booby traps so that they may be disarmed when they are no longer required.
7. It is prohibited to use … booby traps or other devices that employ a mechanism or device specifically designed to detonate the munition by the presence of commonly available mine detectors as a result of their magnetic or other non-contact influence during normal use in detection operations. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 523.4–7.
Canada’s Code of Conduct (2005) provides: “Booby traps are lawful but can only be used in very limited circumstances, and in particular must be directed only at military objectives.” 
Canada, Code of Conduct for CF Personnel, Office of the Judge Advocate General, 2005, Rule 3, § 7.
Canada’s Use of Force Manual (2008), in its Glossary, defines “booby traps” as: “Any device or material which is designed, constructed or adapted to kill or injure and which functions unexpectedly when a person disturbs or approaches an apparently harmless object or performs an apparently safe act.”  
Canada, Use of Force for CF Operations, Canadian Forces Joint Publication, Chief of the Defence Staff, B-GJ-005-501/FP-001, August 2008, Glossary, p. GL-1.
Upon acceptance of the 1996 Amended Protocol II to the Convention on Certain Conventional Weapons, Canada stated: “It is understood that the provisions of Amended Protocol II shall, as the context requires, be observed at all times.” 
Canada, Statements of understanding made upon acceptance of Amended Protocol II to the Convention on Certain Conventional Weapons, 26 June 1998, § 1.