The defense did not know at the time the prospective juror was lying.
In my opinion, prospective jurors should not lie to the court under oath.
Many years ago, the ONLY time I ever got called for jury duty, they were asking their questions to see who they wanted to exclude.
The defense asked us what we thought of punishment.
I had a few moments to compose my thoughts and said, IIRC: for justice to be honorable punishment is the alternative to exoneration.
The judge and prosecutor both nodded appreciatively while the defense looked like he was in shock.
The lady sitting next to me said: “Oh, that’s good!” and he didn’t even let her complete her answer before going on to the next juror.