If you need an orb plus an human to recognize a person, why do you need the orb. Just use the biggest cheapest technology available, just one human and no orb a

If you need an orb plus an human to recognize a person, why do you need the orb. Just use the biggest cheapest technology available, just one human and no orb asking for an ID card. Or a sign of "put your card in this slot to open the door please". Well tested and reliable. But if we think that the orb is doing something here, why not be ambitious? Lets provide each door with a device to extract blood and made a DNA analysis so is 100% granted that every time somebody enter their home is not a thief disguised as the owner