Circumstances in Which an Individual Needs Restricted Firearms or Prohibited Handguns for the Purpose of Section 20 of the Act
Protection of Life
2 For the purpose of section 20 of the Act, the circumstances in which an individual needs restricted firearms or prohibited handguns to protect the life of that individual or of other individuals are where
(a) the life of that individual, or other individuals, is in imminent danger from one or more other individuals;
(b) police protection is not sufficient in the circumstances; and
(c) the possession of a restricted firearm or prohibited handgun can reasonably be justified for protecting the individual or other individuals from death or grievous bodily harm.
<http://laws-lois.justice.gc.ca/eng/regulations/SOR-98-207/page-1.html#h-3>