Harbouring an offender creates criminal liability with graduated imprisonment and fine depending on the concealed offence. Harbouring or concealing a person known or reasonably believed to be the offender, with the intention of screening that person from legal punishment, is an offence requiring an act of harbouring or concealment, knowledge or reasonable belief of the offender's guilt, and specific intention to shield them. Penalties are graduated according to the seriousness of the underlying offence, the provision applies to specified extraterritorial acts, and concealment by the spouse of the offender is excepted.