I'd say that the driver has signed themself into a mental health facility under a doctor's care ("diminished capacity, complete breakdown", what-have-you ploy."

A regular reader's theory on the Fortuna hit and run suspect. This is a comment, which I am reposting.

"Reading between the lines of what has been said (both officially, and in comments on your previous post) I'd say that the driver has signed themself into a mental health facility under a doctor's care ("diminished capacity, complete breakdown", what-have-you ploy.
The CHP or other law enforcement probably can't take her/him into custody
until the doctor says she/he is capable of being released from medical care. 
To be followed by a plea of not guilty by reason of insanity as the driver has no knowledge or memory of what happened.
The vehicle parked at the driver's residence would make sense (for that plea), drove home, no idea of what happened on the way home. "I must have blacked out" the mother said, looking weak and drawn. "I don't know", she kept repeating, then breaking down in tears and crying even though she had been given sedatives/tranquilizers.
A good attorney would have not asked what happened, he/she would have suggested what might have seem to happen: (going home, remembering nothing) and that everything she/he had been told happened was to much to bear, she/he couldn't cope. Then the attorney could have asked: "What do you remember?"
Every person has the right to an attorney and a fair trial. Let's hope the deceased also are given a fair trial and that the driver doesn't get a
"Get out of jail free" card verdict. If I lived in Eureka I'd love to follow the trial in person...I've served on juries (all small time stuff) at the old Hoopa Justice Court. Very different stories from the mundane accounts the Times-Standard or tv news provide. 
Glad you're following up... "