User blog comment:Grimmival/Is Hank a Grimm?/@comment-3563804-20120829000641/@comment-5116706-20130108195728

Wesen have two levels of Woge: the easier, impulse one that Grimms and other Wesen can see, and this is triggered by emotions such as sadness or grief or nervousness. Then there is the level that requires more energy to do. This level is caused by the individual, not impulses. This can happen when they want to be seen, or are extremely angry. This level of Woge is powerful enough for normal humans to see, which is why we have werewolves and Big Foot and such. Hank saw Monroe doing the second level of Woge, the one normal humans can see. So, no, Hank is not a Grimm. He is a normal human who is friends with a Grimm.