If you retain physical evidence of a crime, you run the risk of being charged with obstruction of justice under section 139(2) Criminal Code, which makes it an offence to "willfully attempts in any manner to obstruct, pervert or defeat the course of justice in a judicial proceeding", or possibly with being an accessory after the fact under section 23(1) of the Criminal Code. Ken Murray was in fact charged under s. 139 (2) of the CCC. Research the R v Murray (2000) case and briefly comment on the decision of the judge. You should refer to the 'bloody shirts' and 'smoking guns' analogies examined, and apply these analogies to your response.