Report grading	Description
A = True	Used when there is no doubt as to the authenticity and reliability of the source or verification means used to corroborate it, e.g., digital evidence, official records, as well as incidents witnessed by the research team.
B = Known and/or firsthand source	Related to a source which has, in most instances, proved reliable, and/or provided firsthand information. This could include police officers, regular informants who have proven reliable previously, rescue facilities and witnesses.
C = Corroborated by secondary means	Used when the source is unknown or did not provide firsthand information, but the incident has been confirmed by secondary means.
D = Deemed credible	Used when the information provided reflects details deemed accurate. It may also be used for incidents involving known individuals, e.g., a known seller.
E = Unable to Judge	Used when it is not possible to make an informed decision based on the available evidence, e.g., confusion with species involved (cheetah vs leopard) or the inability to corroborate the information through other sources.
F = Suspected false	Generally, not included in this dataset, but refers to information which is known or believed to be false. It may be possible, however, to make use of the information if it helps us to understand criminal relationships.