It is understandable how Dr. Katz might be conflicted. However in
this circumstance, Dr. Katz should not be a mouse. He should demand that the project be stopped immediately and the animal euthanized. The study
was being conducted in an unethical way because the new procedure had not been approved by the IACUC.
It would be unethical for data derived from this study to be published unless the author disclosed that the data was collected surreptitiously without an approved protocol. It seems unlikely that any journal editor would accept such data.