A W-Five story canvassed various immigrants in Canada yet to be deported due to criminality and contrasted them with 'good' illegal immigrants who have been denied status in Canada.
Link found here.
The article quotes Richard Kurland (now advocating a 'insurance premium' on individuals with Canadian passports, no longer resident in Canada - and reaping benefits from citizenship - aka the rescued dual nationals from Lebanon):
He [Kurland] says the system is set up to go after people who are easy to deport. "What's easier for you to do? Catch grandmothers or criminals?" says Kurland. "It's as simple as that. Do you want to finish your day at 5:30 or 1:00 in the afternoon? If you go after the grandmothers and the sisters, you're home early. If you want to go after the hardened criminals, you got to burn that midnight oil."
I think a lot of Enforcement Officers at CBSA would take issue with Kurland's generalization. My own impressions with CBSA is that there is an effort to remove criminals from Canada, and that they are in fact prioritized over the labourer from Costa Rica who has filed a 'unmeritorious' refugee claim or has overstayed his visa.