Theoretical countermeasure: I get an IR visible tattoo that you can't see in my Facebook pictures but FaceID can. I think the level of equipment needed to pull

Theoretical countermeasure: I get an IR visible tattoo that you can't see in my Facebook pictures but FaceID can. I think the level of equipment needed to pull your attack off couldn't be done off-the-shelf. It seems reasonable that IR camera would scan in detail greater than that of a typical display (say, 500ppi) and it needs 100,000dpi resolution. Then you need bigger displays, advanced optics to reduce it to the expected size without distortion, and so on...