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Darker skin is harder to interpret so paler skinned people are more likely to be identified or recognised than darker skinned people.
Dark skin is harder to interpret for the current iteration of the technology. The gadget should never have left QA in that state, and the fact that it did tells you there were no dark skinned people around during testing. Talking about structural racism in these matters isn't unreasonable.
Those dispensers work on infra red. They’re not racist. Skin colour is irrelevant. It’s the position of the hand that’s relevant.
Facial recognition technology struggles with colour. Darker skin is harder to interpret so paler skinned people are more likely to be identified or recognised than darker skinned people. Not related to dark skinned people all looking the same. It’s the shadows / lack of contrast.