The states key witnesses at a homicide trial were three charged
co-defendants. Petitioner's defense rested upon undermining
the credibility of the co-defendants' accusations against the
petitioner. The state offered a jury instruction on legal
principals recognizing the untrustworthiness of the codefendants
testimony. When petitioner's counsel--- without research ---objected to the entire instruction, did:i.p'i.t;i'ofi'evE , 'ir'e'<i '-i!eV-e'*£h ;ef'f'de'tlve
assistance of counsel?

Whether petitioner received ineffective assistance of counsel when his counsel objected to a jury instruction on the untrustworthiness of co-defendant testimony without researching the issue?