Clear policy? How about legislation? Read and learn, Richard: 
83.201 Everyone who leaves or attempts to leave Canada, or goes or attempts to go on board a conveyance with the intent to leave Canada, for the purpose of committing an act or omission outside Canada that, if committed in Canada, would be an indictable offence under this or any other Act of Parliament for the benefit of, at the direction of or in association with a terrorist group is guilty of an indictable offence and liable to imprisonment for a term of not more than 14 years.
http://laws-lois.justice.gc.ca/eng/annualstatutes/2013_9/page-1.html