It's actually not, Minister.
I'm going to jump in, because you require those police certificates for permanent residents. No, whether you know that or not, that's a fact and it's the case. Therefore, why wouldn't you require them for student visas? This is how this guy got in. You can ask your predecessor, Sean Fraser. He let him in.
I know you're cleaning up a mess whereby I think this government has ruined a generational consensus on immigration. However, why do you take them for permanent residents and not student visas? Why is there a different security check, if this is the terrorist plot that was foiled under this guy?