There’s a paper out called “Disguised Face Identification (DFI) with Facial KeyPoints using Spatial Fusion Convolutional Network”
https://arxiv.org/pdf/1708.09317.pdf [PDF]
The authors claim that it’s possible to use deep learning to recognize face attributes even while wearing a mask. This can have serious consequences for people who appear at protests
I mentioned this last year, but it’s more relevant now because of the increasing frequency and magnitude of protests and corresponding police violence