Has 'trained' overseas: anyone with a passport.
Has 'tried to acquire' bomb-making materials: Reading a book is not illegal. Clicked on the wrong torrent?
Using encryption: everyone.
Masking internet browsing: everyone.
Showing an interest in terrorist events: everyone.
"participating in activities that simulate military or operational environments": anyone who has ever been camping/hiking/played an FPS.
Changed appearance or habits? everyone.
Has "experienced a recent personal loss or humiliation"? Many people.
Has a history of mental health problems? A large proportion of the population.
Substance abuse. Almost everyone.
Hold a belief or ideology that supports the use of violence? Oh what, like "are they a current or former member of the military, politics, or big business?"
This is all really disconcerting in its vagary and scope for misapplication.