i can attest to the fact that thinness/baldness will show up when covered with toppik with night vision mode on..around 12+ years ago i had to use a little toppik in the back and one holiday i was at my sisters house and we were recording. later that night i was going through the vids on the cam and when i go to the one she got of me from the rear you could see right through the toppik. granted it wasnt as though there was nothing there but you could see right through it it wasnt that there wasnt enough either, because right after i deleted the vid i went straight to the bathroom and everything looked fine.

btw it was on night vision. a lot of times it is just a button and some people just leave it on so that they can record in varying light.