Ethan Crumbley Parents Want Evidence Thrown Out in Their Involuntary Manslaughter Trials

School shooter Ethan Crumbley opened fire in a Michigan school, killing four students. He pled guilty to all charges and is now serving life in prison. His parents, James and Jennifer Crumpley, are also charged with involuntary manslaughter. Prosecutors say they should have been aware of their son's mental health and should not have made it possible for him to have access to weapons.  The parents' trials are expected to begin later this month, but now Jennifer Crumbley has asked a judge to dismiss three witnesses who say their testimony could prejudice a jury. A judge has ruled, however, that two of the witnesses will be allowed to testify, with a narrow focus.  The jury will also be allowed to see surveillance video from the school. Joining Nancy Grace today: Troy Slaten – Los Angeles Criminal Defense Attorney, Slaten Lawyers, APC; Twitter @TroySlaten Dr. Jorey L. Krawczyn – Police Psychologist, Adjunct Faculty with Saint Leo University; Research Consultant with Blue Wall Institute, Author: Operation S.O.S. – Practical Recommendations to Help “Stop Officer Suicide” Bobby Chacon – 27 years former FBI Agent; Instagram/Twitter: @BobbyChaconFBI; Writer and Co-producer: Audible Original Series, “After the Fall”  Dr. Jeffrey M. Jentzen – Professor of Forensic Pathology and Director of Autopsy and Forensic Services at the University of Michigan Medical School; Former Medical Examiner in Milwaukee County, Wisconsin Alexis Tereszcuk - CrimeOnline.com Investigative Reporter, Writer/Fact Checker, Lead Stories; Twitter: @swimmie2009 See omnystudio.com/listener for privacy information.