There is an absolute requirement on the police to undertake investigations, with diligence and rigour, to an evidential standard that is established through case law, which would not change as a result of any of the bill’s proposals.I will go through what some of those requirements are in the case law. In Smith v Her Majesty’s Advocate in 1952, it was opined that it is the duty of the police to put before the procurator fiscal everything that may be “relevant and material” to the issue; in McLeod v HMA in 1998, it was opined that“all material evidence for or against the accused”must be disclosed; and, more recently, under McDonald, Dixon and Blair v HMA in 2008, all material evidence that either materially weakens the Crown case or materially strengthens the defence case must be disclosed, so the evidence must be disclosed whether it shows that the suspected party is innocent or guilty.