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
263. Every person who with intent to defeat, obstruct or pervert the course of justice at the trial of any person for any crime, in any manner causes any person to refrain from giving evidence at such trial is guilty of a misdemeanour.
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.