Tanner :
Skinjobs are definitely different from humans. The reason they are hard to detect is the Galactica was a battlestar not a science facility. They barely had enough doctors aboard. It took Gaius Baltar's genius to improvise with the ragtag materials they had at hand. A proper facility in the colonies could have easily detected the skinjobs if they actually tested some of them.
nBSG: Caprica Trailer
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