Right now I am rewatching Season 4 of DS9 and one thing occured to me. When General Martok ( or changeling look like Martok ) arrived DS9 and met Sisko and others , he did a blood test with his own bidding , cut his hand and blood came out , dripping. But it was explained throughly before that when a part of a shapeshifter leaves it turns ts original state. If Martok we saw in this episode was a changeling , how can this be ? Is that a goof by writers ?