Off the top of my head, I figured that Allen, James, and Python have the methods to detect something.
Did not think Book had a passive ability to sense those things, I'll need more information on that.
The thing is not magical in nature. But I am not going to give the information to people willy nilly.
And regardless if other characters have the knowledge, if they're not a part of the "main group", they'd most likely be doing things themselves... maybe passing it on to other heroes in the main group. It depends. I'll determine whether or not it's viable.