Mm, it's not the sort of thing that really runs in families where I'm from. There are tests for academic magic, what most people think of as 'magic'- [There is totally not a tiny touch of bitterness there, oh no.]- but those fall far short of finding ambient mages.

...[Tris is looking at you and frowning a little.] Demons are real where you're from? [As far as she can tell, especially since the signs of an uncontrolled weather-witch were labeled demonic possession, there are no demons at home.] And what's a 'vampire'?