Habeas - En banc
State courts (whether of the first instance or in final de novo review) cannot impose a causal nexus test for nonstatutory mitigating factors when deliberating a capital sentence.
On Federal collateral review, there need not be a clear indication that a state court disregarded a constitutional principle -- AEDPA language controls.
Error was not structural, but also not harmless.
Dissent:
Arizona Supreme Court review was "last instance," but not "de novo."
Presumption that state court followed law.
Court of first instance considered the mitigation.
Error did not prejudice the decision.
https://d3bsvxk93brmko.cloudfront.net/datastore/opinions/2015/12/29/09-99018.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.