Expect an error but this will depend on the brand. "Smudging" is a common trick. Just dab some face oil on the lens, just enough so it can't get detail but not

Expect an error but this will depend on the brand. "Smudging" is a common trick. Just dab some face oil on the lens, just enough so it can't get detail but not so much that the system can tell there's a covering.