Norma relacionada
Practice Relating to Rule 73. Biological Weapons
Colombia’s Basic Military Manual (1995) states that the use, production, possession and importation of biological weapons are banned. 
Colombia, Derecho Internacional Humanitario – Manual Básico para las Personerías y las Fuerzas Armadas de Colombia, Ministerio de Defensa Nacional, 1995, pp. 49–50.
Colombia’s Operational Law Manual (2009) states:
4. Rules for the conduct of hostilities
c. Restrictions on the means and methods
The means and methods of warfare that can be used are limited. Weapons that cause superfluous injury or unnecessary suffering are prohibited. The general principles on the use of weapons establish that “the use of means and methods of warfare which are of a nature to cause superfluous injury or unnecessary suffering is prohibited”. Likewise, “the use of weapons which are by nature indiscriminate is prohibited”.
In this sense, the use of the following weapons is prohibited:
- biological weapons[.] 
Colombia, Manual de Derecho Operacional Manual FF.MM. 3-41 Público, Primera Edición 2009, Comando General de las Fuerzas Militares, aprobado por el Comandante General de las Fuerzas Armadas por Disposición Número 056, 7 December 2009, pp. 40 and 53–54.
[footnotes in original omitted]
Colombia’s Constitution (1991) prohibits the “manufacture, import, possession and use of … biological … weapons”. 
Colombia, Constitution, 1991, Article 81.
In 1995, in a ruling on the constitutionality of the 1977 Additional Protocol II, Colombia’s Constitutional Court stated in relation to the prohibition on the use of weapons of a nature to cause unnecessary suffering or superfluous injury:
Although none of the treaty rules expressly applicable to internal conflicts prohibits indiscriminate attacks or the use of certain weapons, the Taormina Declaration consequently considers that the bans (established partly by customary law and partly by treaty law) on the use of … bacteriological weapons … apply to non-international armed conflicts, not only because they form part of customary international law but also because they evidently derive from the general rule prohibiting attacks against the civilian population. 
Colombia, Constitutional Court, Constitutional Case No. C-225/95, Judgment, 18 May 1995, § 23.