I asked the question on SciFi.Stackexchange, In the Dresdenverse, can Wizards detect each other?, partially spurred on by things that happen in the novel. But I started researching it in relation to the game, and realized that no where in the game did they say one way or the other, other than through The Sight or Soulgaze. The closest thing I can see as justification is Wizard Senses on
YS222, but that still doesn't go into detail on what they can sense- especially if another Wizard is not actively using magic, or indeed doesn't know that they are a wizard. I also noted that on
YS281 it talks about hidden power- but in relation to artifacts or stores of power- not wizards.
Is there something else that I'm missing that's more explicit towards this? Or is this one of those things that's going to vary by campaign?