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Re: DS9 S4: Homefront

Excellent episode, very well done. However one thing just didn't make sense – the blood tests. What happens after you have been tested (to be human)? Why can't a changeling assume someone's identity at a point after they were tested? The only way a blood test would work is if all people tested are monitored continuously thereafter, and there's no way that can be done unless you confine everyone.