How is this possible without obvious scarring?
The procedure isn't surgical. A patient's genetic code is altered to reshape their physical attributes.
Is it reversible?
It's unclear. It only works on people of a certain genetic disposition and the recipient must be induced into a comatose state for several days while their cells regenerate. The data indicates the only way to distinguish the real person from the double is by an ocular scan. A flaw in the iris was deliberately built into the procedure to tell them apart.
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