By Abené Clayton, Photo: Jae C. Hong/AP, The Guardian, June 3, 2022
For decades, US researchers have studied behavioral signs that could help identify people who are at risk of carrying out mass violence.
They have looked at histories of drug abuse, interpersonal violence or “red flag behaviors” like posting images of firearms on social media and threatening their classmates or co-workers.
“These behaviors are observable. Someone can notice if their nephew or neighbor is starting to wear fatigues and carry a gun,” said Mary Ellen O’Toole, a retired FBI agent, profiler and the director of George Mason University’s forensic science program.
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