Kalamazoo- Dalton kills 6 and injures 2

Kalamazoo

Dalton (45) kills 6 and injures 2 on a senseless rampage at 3 locations.

Dalton is in custody.  What are the result's of his blood/drug tests?

Another sad day.

My prayers are with the victims and their families, and friends, and everyone.

What is the cause?  What is the prevention?