Paleontology, like most sciences, is an ever evolving discipline, so it is possible that I am wrong.

Even the Sinornithosaurus' venomous glands finding by Gong et al in 2009 was disputed in 2010 by a team of scientists led by Federico Gianechini. They noted that grooved teeth are not unique to this genus, the teeth were not abnormally long as Gong and his team claimed, but rather had come out of their sockets, and that they could not independently verify the presence of supposed chambers for venom glands cited by Gong's team, finding only the normal sinuses of the skull. Gong and his team also submitted a reassessment of the 2009 study, casting doubt on their findings.

While it is possible that either or both the Tyrannosaurus Rex or the Sinornithosaurus were venomous animals, current evidence does not support this claim.
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