It is important for casualty recorders to work towards avoiding biases. It is recommended in general that all deaths from armed violence or armed conflict are recorded.
Some practitioners may however decide to only record the deaths that were caused by a specific weapon or the casualties of one party to a conflict, in line with their organisation’s purpose. It is not recommended that anyone killed should be excluded from the casualty recording process but if it is done then the principle of transparency demands that casualty recorders make clear the limitations to their data and their inclusion and exclusion criteria.
Standards for Casualty Recording, 2016, p. 20