An unsophisticate search
for law AND Canada OR Canadian turns up a good bunch of interesting material, starting with Marc Ribeiro's 2005 book, Limiting Arbitrary Power: The
Vagueness Doctrine in Canadian Constitutional Law (Vancouver: UBC Press), ISBN 0774810513, with an index that might be useful.
sentencing, sentencing guidelines, due process clause,
vagueness doctrine, void
for vagueness, United States v. Booker