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Chemical Weapons

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Abstract

There is wide agreement that using chemical weapons in warfare is abhorrent and must be prohibited. Chemical weapons have nonetheless, even recently, been used. This chapter argues that chemical weapons are prohibited on the basis of both the international humanitarian law (IHL) principles pertaining to means of warfare as well as arm control law. This is evidenced in the almost universally ratified Chemical Weapons Convention of 1993 (CWC 1993) and a corresponding rule of customary international law. Biological weapons are similarly prohibited, primarily as a result of their inherent indiscriminate character.

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Notes

  1. 1.

    Spiers 2010, p. 11. For a discussion of the ius ad bellum aspects of the invasion of Iraq by the US and its allies, see Weller 2018, pp. 637–661.

  2. 2.

    UNSC 2017.

  3. 3.

    Merkin 1991, p. 175.

  4. 4.

    See generally Jefferson Lab undated.

  5. 5.

    Article 2(1) CWC 1993.

  6. 6.

    Article 2(2) CWC 1993.

  7. 7.

    See Article 23(a) Hague Regulations; Rule 72, ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, pp. 251–254.

  8. 8.

    See generally Rule 76, ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, pp. 265–267.

  9. 9.

    Coleman 2005, p. 6.

  10. 10.

    Coleman 2005, p. 7, see also Merkin 1991, p. 177.

  11. 11.

    Coleman 2005, p. 18.

  12. 12.

    Coleman 2005, pp. 22–24.

  13. 13.

    For example during a German attack on Russian forces at Riga in September 1917. See Coleman 2005, p. 24.

  14. 14.

    Coleman 2005, pp. 44–45.

  15. 15.

    Merkin 1991, p. 181.

  16. 16.

    Coleman 2005, p. 152.

  17. 17.

    Coleman 2005, p. 60.

  18. 18.

    Coleman 2005, p. 60.

  19. 19.

    Boothby 2016, pp. 110–111; Coleman 2005, pp. 59–79; Marauhn 2016, p. 27. Chemical agents were however used on a large scale by the Nazis in their concentration camps.

  20. 20.

    Coleman 2005, p. 89.

  21. 21.

    Coleman 2005, pp. 90–93.

  22. 22.

    Marauhn 2016, p. 27 ; Coleman 2005, pp. 101–103.

  23. 23.

    Marauhn 2016, p. 27; Oygarden 2014, p. 15; Ali 2001, p. 44.

  24. 24.

    Spiers 2010, pp. 104–106; Coleman 2005, pp. 110–111; Ali 2001, p. 52, See also Human Rights Watch 1993.

  25. 25.

    Marauhn 2016, p. 27.

  26. 26.

    See OPCW News: 14 October 2013, ‘Syria’s Accession to the Chemical Weapons Convention Enters into Force’ https://www.opcw.org/media-centre/news/2013/10/syrias-accession-chemical-weapons-convention-enters-force.

  27. 27.

    UNSC 2017.

  28. 28.

    Human Rights Watch 2017.

  29. 29.

    Arms control law is a “branch of public international law [and] consists of the rules and principles of international law related to the control of armaments—‘control’ being understood as encompassing the whole range of prohibitions of armaments quantitative and qualitative arms limitations as well as obligations to disarm.” Den Dekker 2008, p. 75.

  30. 30.

    See generally Boothby 2016, Chaps. 5, 6 and 7, pp. 46–91. See also Tsagourias and Morrison 2018, p. 174 and Van Den Boogaard 2018, p. 524.

  31. 31.

    The Martens Clause was first included in the preamble to the 1907 Hague convention concerning land warfare and subsequently in most IHL instruments. See for example O’Connell 2013, pp. 33–34. The Martens Clause is commonly understood to mean that “[i]f an act of war is not expressly prohibited by international agreements or customary law, this does not necessarily mean that it is actually permissible.”

  32. 32.

    International Court of Justice Advisory Opinion, 8 July 1996, Legality of the Threat or Use of Nuclear Weapons, p. 257, para 78. Available here: http://www.icj-cij.org/files/case-related/95/095-19960708-ADV-01-00-EN.pdf.

  33. 33.

    Cassese 2008, p. 41.

  34. 34.

    Kalshoven 2007, pp. 395–396: “…as yardsticks, they should be able to support a fairly straightforward determination of the legal issue. As guidelines, they need to provide little more tha[n] a set of basic, perhaps mutually conflicting, considerations that must be weighed in arriving at such a decision.”

  35. 35.

    Henckaerts and Doswald-Beck 2005, p. 242 and 248. See also generally Van Den Boogaard 2013 and Zwanenburg 2008, pp. 114–119.

  36. 36.

    Geneva Convention relative to the Treatment of Prisoners of War (12 August 1949) 75 UNTS 135, entered into force 21 October 1950 Common Article 3; Protocol Additional to the Geneva Conventions of 12 August 1949, and relating to the Protection of Victims of Non-International Armed Conflicts (8 June 1977) 1125 UNTS 609, entered into force 7 December 1978.

  37. 37.

    As Dinstein notes: “there are several cardinal principles lying at the root of the law of international armed conflict. Upon examination, none is more critical than the principle of distinction.” Dinstein 2008, p. 1.

  38. 38.

    ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, Rules 1-24, pp. 1–76.

  39. 39.

    ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, Rule 71, pp. 244–250.

  40. 40.

    For a short explanation: Doswell 2015: What makes weather so unpredictable? Available online https://www.quora.com/What-makes-weather-so-unpredictable-Why-is-it-so. See also this explanation of the so-called ‘butterfly effect’: Wikipedia undated.

  41. 41.

    See for example World Health Organisation 1970, see also UNGA undated.

  42. 42.

    International Court of Justice, Legality of the Threat or Use of Nuclear Weapons, Advisory Opinion, I.C.J. Reports 1996, p. 226, para 78 on p. 257.

  43. 43.

    1868 St. Petersburg Declaration Renouncing the Use, in Time of War, of Explosive Projectiles under 400 Grammes Weight, Preamble.

  44. 44.

    Boutruche 2008, pp. 103–106.

  45. 45.

    Aubert describes how this principle may be put into practice using the example of incendiary weapons: “[i]nstinctively, man is afraid of fire. The injuries caused by incendiary weapons (burns and lesions due to the release of toxic gases) are particularly painful and, to be treated, they require greater hospital facilities than is the case for bullet or shrapnel wounds.” Aubert 1990, p. 489.

  46. 46.

    Haines 2014, pp. 285–286.

  47. 47.

    Boutruche 2008, p. 108.

  48. 48.

    Ali 2001, p. 52.

  49. 49.

    Coleman 2005, p. 18.

  50. 50.

    Pechura and Rall 1993, pp. 131–145. Causing permanent blindness was also one of the major drivers for prohibiting laser weapons in Protocol IV to the Certain Conventional Weapons Convention of 1995.

  51. 51.

    Uribe 2013: “Nerve agents such as sarin cause an overstimulation of the nerve cells and prevent the proper operation of glands and muscles. Symptoms can appear within seconds or even hours and include blurred vision, excess salivation, vomiting, difficulty thinking, muscle twitches, convulsions, paralysis and respiratory failure.” Available at: https://www.undispatch.com/syrians-now-face-the-long-term-effects-of-exposure-to-chemical-warfare/.

  52. 52.

    See for example World Health Organisation 1970.

  53. 53.

    Centers for Disease Control and Prevention 2018, ‘Phosgene’. Available at: https://emergency.cdc.gov/agent/phosgene/basics/facts.asp.

  54. 54.

    Jones and Greenberg 2007, pp. 727–728.

  55. 55.

    The ICRC Customary Law Study cites the military manuals of Australia, France and Germany in support of this conclusion, noting that “[t]he prohibition on the use of chemical and biological weapons in the Geneva Gas Protocol was originally motivated by this rule”. ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, Rule 70, p. 237.

  56. 56.

    See also Article 55 (1) API: “Care shall be taken in warfare to protect the natural environment against widespread, long-term and severe damage. This protection includes a prohibition of the use of methods or means of warfare which are intended or may be expected to cause such damage to the natural environment and thereby to prejudice the health or survival of the population.”

  57. 57.

    This treaty however has limited relevance, since it merely prohibits the use of the environment as a weapon. Nonetheless, the ENMOD Convention has a lower threshold for effects on the natural environment, because the damage can be alternatively widespread, long-lasting or severe. See Article 1: “[e]ach State Party to this Convention undertakes not to engage in military or any other hostile use of environmental modification techniques having widespread, long-lasting or severe effects as the means of destruction, damage or injury to any other State Party.”

  58. 58.

    Rule 44, ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, pp. 147–151.

  59. 59.

    See for example Dinstein 2016, p. 244. See also International Law Commission undated.

  60. 60.

    Dinstein notes that in his opinion, “the bar set up by API is too high”. Dinstein 2016, p. 250.

  61. 61.

    “In cases not covered by international agreements, the environment remains under the protection and authority of the principles of international law derived from established custom, from the principles of humanity and from the dictates of public conscience.”

  62. 62.

    The draft principles were adopted during the 77th Session of the ILC in Geneva in April–June 2019. See http://legal.un.org/docs/index.asp?symbol=A/CN.4/L.937.

  63. 63.

    Rule 3, ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, pp. 11–14.

  64. 64.

    OPCW undated-a, Concerns, https://www.opcw.org/our-work/eliminating-chemical-weapons. See also Edwards 2011, ”MoD investigates former chemical weapons factories for contamination” The Guardian.

  65. 65.

    Rogers 2004, p. 176.

  66. 66.

    Merkin 1991, p. 178. See also Coleman 2005, p. 151.

  67. 67.

    Oeter 2013, p. 163.

  68. 68.

    Raičević 2001, p. 621.

  69. 69.

    Oeter 2013, p. 164.

  70. 70.

    Scharf 1999, p. 481.

  71. 71.

    See for example UNGA undated.

  72. 72.

    For a commentary of the CWC 1993, see generally Krutzsch et al. 2014.

  73. 73.

    See OPCW undated-b, https://www.opcw.org/about-us/member-states. It may be noted that Israel did sign the CWC 1993.

  74. 74.

    Article VIII (1) CWC 1993.

  75. 75.

    Krutzsch et al. 2014, p. 8.

  76. 76.

    According to the OPCW, 97% of the chemical weapons stockpiles declared by possessor States have been verifiably destroyed. See OPCW undated-b, https://www.opcw.org/about-us/member-states. See also OPCW 2016.

  77. 77.

    For an analysis: see Akande 2013, https://www.ejiltalk.org/can-the-icc-prosecute-for-use-of-chemical-weapons-in-syria/.

  78. 78.

    ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, rule 74, pp. 259–263.

  79. 79.

    ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, Vol II, Practice, p. 1662: Mendoza Declaration on Chemical and Biological Weapons, Mendoza, 5 September 1991; Cartagena Declaration on the Renunciation of Weapons of Mass Destruction, Cartagena, 5 December 1991.

  80. 80.

    ICRC Customary International Humanitarian Law Study, Henckaerts and Doswald-Beck 2005, Vol II, Practice, p. 1663. See for instance the military manuals of Australia, Bosnia and Herzegovina, Canada, Colombia, Ecuador, Germany, Italy, Kenya, South Africa, Spain and Yugoslavia.

  81. 81.

    ICTY, Prosecutor v Tadic, Case No. 94-1-AR72, Decision on the defence motion for interlocutory appeal on jurisdiction, p. 124: “there undisputedly emerged a general consensus in the international community on the principle that the use of [chemical] weapons is also prohibited in internal armed conflicts”

  82. 82.

    See for example Boothby 2016, p. 123: “[i]t is now clear that the prohibition of the use of chemical weapons is a rule of customary law, and therefore binds all States including those not party to the CWC [1993].” See also Oeter 2013, p. 162, Krutzsch et al. 2014, p. 3, Dinstein 2016, p. 92 and Asada 2016 p. 188.

  83. 83.

    S/RES/2118(2013) Adopted by the Security Council at its 7038th meeting, on 27 September 2013, p. 2.

  84. 84.

    See for example Blake and Mahmud 2013, available at: https://www.uclalawreview.org/a-legal-%E2%80%9Cred-line%E2%80%9D-syria-and-the-use-of-chemical-weapons-in-civil-conflict/ and Van Schaack 2016, available at: https://www.justsecurity.org/32309/chemical-weapons-returns-syria/.

  85. 85.

    See for example Melzer and Gaggioli Gasteyger 2015, pp. 63–92.

  86. 86.

    Geiss 2010, p. 342.

  87. 87.

    Article 2(7) CWC 1993. Pepper spray and tear gas are two types of chemicals that would fall within the scope of this article.

  88. 88.

    Thus, in the view of the US, the use of riot control agents would be permitted to quell an uprising of prisoners of war; in situations in which civilians are used to provide cover for an attack; for rescue missions; to prevent prisoners from escaping and “to protect convoys from civil disturbances, terrorists and paramilitary organisations” See US Government 1975.

  89. 89.

    Cathcart 2015, 447–448: “caution dictates that any uses of [riot control agents] that could be reasonably perceived as a ‘method of warfare’ should be avoided.”

  90. 90.

    Wheelis 2002, pp. 971–975, Bartlema 1965, p. 476.

  91. 91.

    Smith 2002, available at https://journalofethics.ama-assn.org/article/old-tactics-new-threat-what-todays-risk-smallpox/2002-09. A similar tactic seems to have been used by British Colonial troops fighting native American tribes. Bartlema 1965, p. 476.

  92. 92.

    The parties to the 1929 Gas Protocol declared to “agree to extend [the prohibition of the use of chemical weapons] to the use of bacteriological methods of warfare (…)”.

  93. 93.

    Boothby 2016, p. 111.

  94. 94.

    See for example UN General Assembly Resolution, A/RES/72/71, 4 December 2017: “Welcoming the reaffirmation made in the Final Declarations of the Fourth, Sixth, Seventh and Eighth Review Conferences that under all circumstances the use of bacteriological (biological) and toxin weapons and their development, production and stockpiling are effectively prohibited under Article I of the Convention”.

  95. 95.

    See Rule 73 of the ICRC Customary IHL Study, Henckaerts and Doswald-Beck 2005, pp. 256–248. See also Boothby, claiming that the customary rule extends also to the possession of such weapons.

  96. 96.

    Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological (Biological) and Toxin Weapons and on Their Destruction. The treaty was opened for signature on 10 April 1972 and entered into force on 26 March 1975. As of July 2019, 182 State have ratified the treaty.

  97. 97.

    See https://www.un.org/disarmament/wmd/bio/.

  98. 98.

    Boothby 2016, note 64 on p. 114.

  99. 99.

    Marauhn 2016, pp. 41–42.

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van den Boogaard, J.C. (2022). Chemical Weapons. In: Sayapin, S., Atadjanov, R., Kadam, U., Kemp, G., Zambrana-Tévar, N., Quénivet, N. (eds) International Conflict and Security Law. T.M.C. Asser Press, The Hague. https://doi.org/10.1007/978-94-6265-515-7_14

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