That is such an important question.
CBSA doesn't just declare people members of the regime or members of the IRGC. We have to prove it. Designating the regime renders everybody in the top half, the executive, inadmissible. The IRGC, by nature of its organization, renders everybody who has served in it inadmissible.
To your point, CBSA has to prove this before the IRB in order for the individual to be declared formally inadmissible and be removed. Consideration about coercion to serve is material in those cases.
CBSA deploys its resources to those at the upper echelons, we'll say. I don't want to say we won't have more junior people. We really try to focus the cases we make and the research we're doing, having regard for the mandatory military service you talked about. The regime is not entirely nuanced if you're a member, but it's at the IRB where those issues can be brought forward.
When you look at the priorities of the CBSA, junior members who served a minimum amount of time may find themselves less of a priority for CBSA officers than somebody who is senior in the regime.