(65 ILCS 5/3.1-15-25) (from Ch. 24, par. 3.1-15-25)
    Sec. 3.1-15-25. Conservators of the peace; service of warrants.
    (a) After receiving a certificate attesting to the successful completion of a training course administered by the Illinois Law Enforcement Training Standards Board, the mayor, aldermen, president, trustees, marshal, deputy marshals, and policemen in municipalities shall be conservators of the peace. Those persons and others authorized by ordinance shall have power (i) to arrest or cause to be arrested, with or without process, all persons who break the peace or are found violating any municipal ordinance or any criminal law of the State, (ii) to commit arrested persons for examination, (iii) if necessary, to detain arrested persons in custody over night or Sunday in any safe place or until they can be brought before the proper court, and (iv) to exercise all other powers as conservators of the peace prescribed by the corporate authorities.
    (b) All warrants for the violation of municipal ordinances or the State criminal law, directed to any person, may be served and executed within the limits of a municipality by any policeman or marshal of the municipality. For that purpose, policemen and marshals have all the common law and statutory powers of sheriffs.
(Source: P.A. 90-540, eff. 12-1-97.)