Looking through other articles it really seems to be flagging up "people of interest" in terms of terrorism more than anything. I suppose the crux is you have a caution / arrest for assault, a DUI or something lese that would not cause you to tick "Yes" on the ESTA may now be flagged up and CBP just decided to become real bastards with everyone. I can't see anything yet about anyone being sent home or turned away on Twitter or news outlets.
So, next week I'll be a crash test dummy for it.
So, next week I'll be a crash test dummy for it.