to prevent and detect crime,

to maintain order,

to protect life and property,

to take such lawful measures, and make such reports to the appropriate prosecutor, as may be needed to bring offenders with all due speed to justice,

where required, to serve and execute a warrant, citation or deliverance issued, or process duly endorsed, by a Lord Commissioner of Justiciary, F1sheriff, summary sheriff or justice of the peace in relation to criminal proceedings, and

to attend court to give evidence.