Criminal Code of Canada
PART XVI- COMPELLING APPEARANCE OF ACCUSED BEFORE JUSTICE AND INTERIM RELEASE
INFORMATION, SUMMONS AND WARRANT
507. (4) Where a justice considers that a case is made out for compelling an accused to attend before him to answer to a charge of an offence, he shall issue a summons to the accused unless the allegations of the informant or the evidence of any witness or witnesses taken in accordance with subsection (3) discloses reasonable grounds to believe that it is necessary in the public interest to issue a warrant for the arrest of the accused.
(5) A justice shall not sign a summons or warrant in blank.
Arrest
Arrest for national proceedings
EDIT.