An unacceptable lack of precision in legislation that leaves its meaning and application so uncertain as to unduly threaten a protected right or freedom.

A principle of fundamental justice that is offended by a law that does not provide a framework for legal debate that provides fair notice to citizens and limits law enforcement discretion. Vagueness can also be relevant to determining whether an objective constitutes a just cause for the denial of bail and whether a limit on a Charter right is prescribed by law.

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