The murder trial of former Dallas Police Department Officer Amber Guyger is entering its fourth day. The Judge in the trial will not allow certain testimony from a lead investigator. Texas Ranger David Armstrong said, outside the presence of the jury, that he doesn’t believe Guyger committed a crime. Prosecutor Jason Hermus says Armstrong’s “opinion” is not beneficial to the jury. Judge Tammy Kemp ruled that Armstrong cannot testify about that opinion or about where he thinks Botham Jean was in the apartment when he was shot.