information is acquired nevertheless, it must be properly collected, handled, packaged, labeled, and stored to prevent contamination and loss (see Sections 3.2 and 3.3 on how and whether to collect and manage physical and forensic information). In order to properly store physical information: • Ensure that each piece of physical information carries a separate statement; • Detail in the statement when, where, and by whom the piece of potential evidence was found; • Use chain of custody templates (such as provided in Appendix 1) to document the initiation and continuation of who held custody over the information; and • Ensure that the person who found the object also signs the statement.189 Restrict access to potential physical information. For each person that accessed the information, document the following: • His/her name; • When s/he accessed the information; • How s/he used the information; and • Why it was important to grant him/her access. 4.2.5 Electronic information When encountering electronic or digital information that can potentially serve as evidence of human rights violations it is important to verify that the electronic or digital information has not been tampered with. The Verification Handbook is helpful for guidelines on how to verify electronic or digital information that has, for instance, been uploaded to Facebook, Twitter, or YouTube. Section 3.1.2 of this Handbook provides several guidelines on digital information. For example, it discusses a number of tools that can be used to collect information and to secure its metadata at the same time (i.e. eyeWitness to Atrocities, CameraV). Bear in mind that metadata may be lost 189 Office of the High Commissioner for Human Rights, Professional Training Series No. 7: Training Manual on Human Rights Monitoring, 107 (2001), available at http://www.ohchr.org/Documents/Publications/training7Introen.pdf. 122