, Stein says that "Hanna . . . has obscured as many issues as it has clarified." In recent years in diversity cases, the federal courts, which have not acted uniformly in this area, have tended to "return to the post-Erie emphasis on state powers." In this case, the Federal Rules of Evidence, while procedural in one sense, can have a decisive impact on the substantive outcome of the case. Their application, in the face of California's consistent rejection of RMs testimony, would definitely encourage forum-shopping by plaintiffs and might lead to an unprecedented and unwarranted expansion of the substantive content of the child abuse tort alleged. Under those c
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