A corporate employee with a visa problem isn’t likely to be camping in the cold, waiting for a chance to wade across the river. Nevertheless, they can run into serious problems and so can their employers. In this issue of Today’s General Counsel, immigration attorney Jeffrey A. Margolis presents an overview of the visa issues that in-house counsel might encounter in his area of law. He says immigration is second only to tax law in its byzantine complexity. Timothy A. Pratt, former General Counsel at Boston Scientific, discusses challenges to scientific testimony in intellectual property and other litigation, and the trial courts’ reluctance to uphold their responsibility as gatekeepers. Last June, the Judicial Conference’s Committee on Rules of Practice and Procedure approved an amendment to Rule 702 that clarifies standards of admissibility, but federal courts are applying it inconsistently, which brings costly appeals and protracted litigation.