Part 2. Investigations.
Section VII. General rules on investigations.
Article 54
The act in question shall be investigated and all available evidence pertaining to it shall be collected, e.g. as regards the place and time of its commission and all further circumstances that may be regarded as being of potential significance; the person suspected of the offence shall be sought; witnesses and others who may be regarded as likely to be able to give testimony , shall be found; items to be seized, and other visible pieces of evidence, shall be located . In addition, the scene of the crime, where appropriate, shall be examined, as shall all signs that may remain following commission of the offence.
An examination shall be made of matters pertaining to the accused himself or herself, including (according to whether there is reason to do this) his or her age, personal circumstances (such as family and home background), education, employment and financial standing, conduct and previous offences and his or her level of maturity and state of health, both mental and physical.
An examination shall be made of the accused’s attitudes and motivation for the offence, whether he or she committed the offence on purpose or, as appropriate, through negligence and, if it constituted an attempt, whether he or she abandoned it by free choice. If more than one person was involved in the offence, their parts in it shall be investigated, where possible, separately .