CRIMINAL CODE
PART I - General Provisions
TITLE XV - Perjury and Obstruction of Public Justice
1. Perjury and Other Crimes Relating to Evidence and to Judicial Proceedings
258. Every person who unlawfully, with intent to defeat, obstruct or pervert the course of justice, or to defraud or injure any person, removes, conceals, injures or alters, any instrument or document used or intended to be used in any judicial proceeding, shall be liable to imprisonment for two years.
Offences against administration of justice
Corruptly influencing a witness, obstructing or interfering with the attendance or testimony of a witness, retaliating against a witness for giving testimony or destroying, tampering with or interfering with the collection of evidence
National penalties - offences against the administration of justice
National penalties - maximum penalty
EDIT.