In an eagerly awaited ruling on the admissibility of expert testimony, the Court of Appeals on Tuesday left no question that a solid scientific foundation must support allegations of toxic tort injury. But it also rejected a 2nd Department calculus that would have erected a high hurdle for plaintiffs claiming they were injured by exposure to carcinogens.

Tuesday’s holding in Parker v. Mobil Oil Corp., 107, was a mixed bag for attorneys and courts looking for guidance, and for toxic tort victims looking for relief.