Boyde v. State
In Boyde v. State, 513 S.W.2d 588, 589-90 (Tex. Crim. App. 1974), a police officer was asked whether, at the time of arrest, he was "totally satisfied" that the defendant was guilty and whether he knew of any evidence which would tend to exonerate the defendant or show that he was not guilty.
The Court of Criminal Appeals held that this was improper. See Boyde, 513 S.W.2d at 590.