Watching SFDebris' review of "Homefront" again...
PNQ: Why do the characters think that the blood tests would be so easy to evade?
I mean, blood without continual access to fresh oxygen would be quite different chemically from fresh blood. Blood stored within a changeling would be "dead" and easy to detect by the specially-designed hypospray that's used to take the sample, right?
For that matter, if you don't mind a bulkier option another way to detect changelings is to stick a hand into a special device. You get injected with an anesthetic, a skin sample is taken including blood, and then it's immediately healed with a special dermal regenerator.
Actually, now that I think about it why wasn't the polaron radiation thing revisited in later episodes? Surely refining it into a low-level phaser beam would let you test people with it without killing solids with radiation poisoning, right?
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