$4 billion taxpayer dollars LA Times reported $4 billion taxpayer dollars $4 billion spent over $4 billion LA Times reported $4 billion taxpayer dollars study LA Times reported $4 billion taxpayer dollars Los Angeles Times well-respected study LA Times reported LA Times reported LA Times reported California spends $308 million on each execution LA Times reported $1 billion in five years $184 million per year LA Times reported some $200 million per year