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 I bet someone could use freeware photogrametry software to reconstruct your face, then 3D print a model that might fool the lidar...  
 It was possble in the past. Now, few years later I am not sure. 

Anyway, if you ever get into trouble, hold locking button and volume buttons at the same time and it will close the screen and disable faceID 
 What would be the thing that would prevent something like this from working? Photogrametry has vastly improved, as has 3D printing. If there's a visual component involved, then it's not hard to project a person's face onto the printed form. 

I haven't looked into the latest apple capabilities since, quite frankly, IDGAF, but I suppose I should learn more.