You make a website with a sign-up form. You stress that it is voluntary. Voluntary! Just until we figure things out.
You make a category for the people who go there, who list their mosque, their birthplace. The category is “compliant.” Just so we have that figured out.
You bring people in for little reasons, things that could be overlooked. You search their name on your website.
You say, did you sign up? Huh. Well.
You explain that only noncompliant people are being held. They had a choice. They chose.
And now you can figure them right the fuck out.