03-05-2019, 07:08 PM
(This post was last modified: 03-05-2019, 07:13 PM by FaceInTheCrowd.)
I think the episode in which a wesen nurse had to slap a sedated Trubel into semi-consciousness and woge so that she could see Trubel's eyes change is a pretty good indication that that's the only way they can tell for sure.