If it's an evidentiary shortcoming, then we, as a committee, need to know what needs to be done to fix that. You said yourself that they have violated Canadian law. If they have violated Canadian law, it seems to me that they should be able to be arrested.
Section 83.181 of the Criminal Code states:
Everyone who leaves or attempts to leave Canada...for the purpose of committing an act or omission outside Canada that, if committed in Canada, would be an offence under subsection 83.18(1) is guilty of an indictable offence and liable to imprisonment for a term of not more than 10 years.
It seems to me that that section of the act should be able to be used with these 80 folks who have returned to Canada from fighting with what we have named as terrorist entities.
Has that act been used to charge anyone in Canada? I know one individual was charged six months after he left the country, but he isn't in Canada. Has anyone in Canada been charged under that section? If not, why not?