It's never been officially stated that's the case, but it's a logical deduction. After all, we've seen confirmed changelings foil blood screenings on other occasions, hell in The Adversary one impersonating Bashir was able to not only pass himself off as solid, but turn Eddington's blood sample into shapeshifting goop. Joe Sisko could figure out the ploy. And besides, a changeling infiltrating a society which has a singular obsession with bladed weapons would logically prepare himself for inevitable cutting and or stabbing.Is that true about Martok? Or are you pulling my tentacle?Thanks for the answer if you're right!
JB