UNLIREC carries out double cast training in Trinidad and Tobago

From 29 May – 1 June, the United Nations Regional Centre for Peace, Disarmament and Development in Latin America and the Caribbean (UNLIREC), together with ARQUEBUS Solutions Ltd delivered its first Double Cast training in the Caribbean, in Trinidad and Tobago

Five participants, among them firearm examiners, IBIS Technicians and Armourers of the Trinidad and Tobago Forensic Science Centre (TTFSC) and Trinidad and Tobago Police Service (TTPS) participated in the 4-day Training, based on INTERPOL’s Double Casting methodology.

Double casting increases the ability of national authorities to make connections between crime and crime scenes, nationally, regionally and internationally. The training sought to build capacity in the region to create microscopic replicas of projectiles and cartridge cases that can be peer reviewed and uploaded to a Ballistics Information Network or shared across jurisdictions for comparison without disturbing the chain of custody of the original evidence.

Double Casting is a two step-process that requires a silicone mould to be made of the fired bullet or cartridge case and then making a resin cast using the mould created. Ballistic projectiles are mounted in a secured cup or mould box before pouring the silicone to make the mould. The moulds are then placed in a pressure pot to remove air bubbles, taken out of the pot, and cured for 15–24 hours. The cured mould is then removed from the cup or box and the specimen extracted. Next, the silicone mould is filled with casting resin, pressurized in a pressure pot, removed and the cured resin cast demoulded. The resin bullet and cartridge castings are then ready for ballistics imagining or microscope examination and comparison.

Equipment used in the training as well as consumables to conduct further, practical double casting of projectiles were handed over to the Government of Trinidad and Tobago.

Double Cast Training are part of the fourth round of implementation under the framework of the UNLIREC’s Caribbean Operational Forensic Ballistics Assistance Package, which is made possible thanks to the support of the US Department of State and the Government of Canada.

UNLIREC, as the regional organ of the UN Office for Disarmament, seeks to advance the cause of practical disarmament in Latin America and the Caribbean as part of its commitment to support Member States in their implementation of international disarmament and non-proliferation instruments, in particular, the 2001 UN Programme of Action on Small Arms.

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