Otherwise, potential sources of information include: a death certificate, autopsy report, eye-witness reports, photographs and videos, media reports, prison and custody records, and military records of operation. 120 Like with recording any crime scene related to serious human rights violations, it is also useful to describe the prevailing political, social, economic and legal climate of the state and area concerned. Consider noting situations of political unrest and generalized repression of human rights. It may also be useful to establish whether there are conflict zones, and consider how information may suggest which parties to the conflict may be responsible, avoiding the perpetration of bias and stereotypes. 121 3.3.4 Artifacts Artifacts are human made objects. Artifacts that are found on crime scenes may be sources of forensic information and are therefore of interest to professional investigators, particularly those that may contain biometric data. Biometric data are unique, identifying physical features, such as finger prints, face recognition, DNA, palm veins, palm print, hand geometry, iris recognition, retina and odors/scents. Objects that may have forensic information include: • Objects that have inflicted injury, such as weapons • Any items that belonged to the possible perpetrator • Clothing of victims • Ordinary objects that show signs of having been used during or otherwise bear the marks of the crime committed 122 • Mobile phones, including metadata (see Section 3.1.2 on Digital Information) • Documents. 120 Kate Thompson and Camille Giffard, REPORTED KILLINGS AS HUMAN RIGHTS VIOLATIONS, 60 (2000), available at https://www.essex.ac.uk/reportingkillingshandbook/english/reporting_killings_handbook.pdf. 121 Kate Thompson and Camille Giffard, REPORTED KILLINGS AS HUMAN RIGHTS VIOLATIONS, 61-65 (2000), available at https://www.essex.ac.uk/reportingkillingshandbook/english/reporting_killings_handbook.pdf. 122 Morten Bergsmo and William Wiley, Human Rights Professionals and the Criminal Investigation and Prosecution of Core International Crimes, in MANUAL ON HUMAN RIGHTS MONITORING: AN INTRODUCTION FOR HUMAN RIGHTS FIELD OFFICERS, 15 (3rd ed., 2008), available at http://www.casematrixnetwork.org/fileadmin/documents/M._Bergsmo_and_W.H._Wiley__Human_Rights _Professionals_and_Criminal_Investigation__NCHR_Manual__10__pp._1-29.pdf. 90