INVESTIGATIONS IN GENERAL All investigations, including interviewing of witnesses, victims and suspects, personal searches, searches of vehicles and premises, interception of communications: ● shall not be unlawful, arbitrary, unduly intrusive or biased ● shall be competent, thorough, prompt and impartial, and lawful ● shall include careful processing of crime scenes ● shall seek to collect and preserve evidence OHCHR Police Trainer’s Guide Session 5 (Investigations)/3 64