CIVIL ARREST的条款非常含糊。用的是 “MAY"。 可以，但是并不绝对,
Canada
Section 494. (Criminal Code)[6]
(1) ARREST WITHOUT WARRANT BY ANY PERSON
Any one may arrest without warrant/s
(a) a person whom he finds committing an indictable offence; or
(b) a person who, on reasonable grounds, he believes
(i) has committed a criminal offence, and
(ii) is escaping from and freshly pursued by persons who have lawful authority to arrest that person
(2) ARREST BY OWNER, ETC., OF PROPERTY
Any one who is
(a) the owner or a person in lawful possession of property, or
(b) a person authorized by the owner or by a person in lawful possession of property
may arrest without warrant a person whom he finds committing a criminal offence on or in relation to that property.
(3) DELIVERY TO PEACE OFFICER
Any one other than a peace officer who arrests a person without warrant shall forthwith deliver the person to a peace officer.
http://en.wikipedia.org/wiki/Citizen's_arrest#Canada