According to the series "there is no way to tell a contractor" in the series. Though based on events I could probably think of one way: get the target and stick it into a room; have a surveillance specter appear on the left or right and a hologram resembling the specter appear on the opposite side (based on a random criteria); the subject needs to identify where the apparition is a controlled number of times. Getting it wrong even once means the subject is not a normal human (Contractors would need to guess, humans would see only the hologram).
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