The white-supremacist, Frazier Glenn Cross Jr (aka F. Glenn Miller) is show in the above image just prior to his first court appearance today for the alleged murder of three people at two different Jewish Centers in suburban Kansas City, Kansas on 13 April 2014.
The primary emotion he is expressing on his face at the moment of this image is that of disgust - although there could be a component of contempt as well - which is not fully discernible due to the angle of the photo.
Although every human being expresses disgust and contempt occasionally, those who perpetrate hate crimes, mass-shootings, and terrorism often display either or both of these facial expressions chronically. These body language/facial expression signals are thus extremely useful in threat assessment.
If one looks back at a 2006 interview (below) we can see prolonged disgust - and very unfortunately a deadly harbinger.
Nonverbal Communication Analysis No. 2769: Smiling Out of Context in a Mass Shooter - T.J. Lane's Body Language
Nonverbal Communication Analysis No. 2503: Fort Hood Shooter and his Tell-Tale Body Language Common to many Mass-Killers - Nidal Malik Hasan gets the Death Penalty
Nonverbal Communication Analysis # 2231: A Common Facial Expression of Mass Killers - Using Body Language as a Threat Assessment Tool
Nonverbal Communication Analysis No. 2517: Bashar al-Assad Fears Over-Throw if U.S. Attacks, Body Language Tell During Charlie Rose Interview Part II
Nonverbal Communication Analysis # 2312: Bruce Willis' Body Language - Contempt vs. Suppressed Smile vs. Pseudo Smile vs. Sincere Smile
Nonverbal Communication Analysis No. 2640: Disgust at Denver area School Shooting - Body Language Tells
Nonverbal Communication Analysis No. 2785: Oscar Pistorius - Another Day of Testimony - Low Confidence Body Language Display