21. (1) Every warrant shall be signed by the justice or justices of the peace issuing the same, and may be directed either to any constable by name, or to such constable and all other constables within the territorial jurisdiction of the justice or justices of the peace issuing it, or generally to all constables within such jurisdiction, or to all other persons authorized by any act or law to execute it.
(2) The warrant shall state shortly the offence for which it is issued, and shall name or otherwise describe the accused; and it shall order the officer or officers to whom it is directed to apprehend the accused and bring him before the justice or justices of the peace issuing the warrant, or before some other justice or other justices of the peace having jurisdiction to hear, try, determine and adjudge the charge contained in the information or complaint, to be further dealt with according to law.
(3) It shall not be necessary to make such warrant returnable at any particular time, but the same shall remain in force until it is executed.
(4) The fact that a summons has been issued shall not prevent any justice of the peace from issuing a warrant at any time before or after the time mentioned in the summons for the appearance of the accused.
(5) In case the service of the summons has been proved and the accused does not appear, or when it appears that the summons cannot be served, a warrant as in form 6 may issue.