Was there anything this state trooper could have done, based on a hunch?

Yesterday in Leavenworth, Kansas,Donny Jackson, murdered his 11 and 14 year old sons and kidnapped his 2 little girls, ages 5 and 7. An Amber alert was issued at about 3. (God I hate the sound my phone makes with that.)
“Authorities said that the Kansas Highway Patrol made an unrelated car stop on Jackson’s car on Highway 169 near the Oklahoma border at 12:35 p.m. before police were alerted to the homicides. The girls were in the vehicle.”

I am just speculating, but I think those girls witnessed some seriously traumatic events just an hour earlier. Are law enforcement trained to recognized traumatized people? I’m pretty sure I would recognized a traumatized child when I saw one. Is there anything he could have done?