Is there any case law where a defense counsel was permitted to access a file containing mitigating evidence?

attorney would have realized that pursuing these leads was necessary to making an informed choice among possible defenses . . . . Had counsel investigated further, they might well have discovered the sexual abuse later revealed during state postconviction proceedings."); Stankewitz v. Wong, 698 F.3d 1163, 1171 (9th Cir. 2012) ("The state's argument that [defense counsel's] mere possession of [files containing leads to mitigating evidence] demonstrates that [he] conducted a reasonable investigation defies logic - if anything, that [he] had this evidence at his fingertips but did not investigate or present it is further proof of his deficiency.").