American Civil Liberties Union

A New Jersey fusion center recently issued a report on trends correlated with mass shootings, and singled out several innocuous or arbitrary warning signs that a co-worker or employee may pose a threat, including absenteeism; workplace discussion of domestic problems; and decreased attention “to appearance and hygiene”. 

http://www.wired.com/dangerroom/2013/01/mass-killings-patterns/

Read the fusion center report here: http://info.publicintelligence.net/NJROIC-MassShootings.pdf

Learn more about fusion centers here: http://www.aclu.org/fusion-centers-force-multiplier-spying-local-communities