Department of Revenue of Kentucky v. Davis
DAVIS SAYS Kentucky hampers interstate commerce by taxing other states’ bonds while exempting its own.
KENTUCKY SAYS A similar tax structure in Ohio was found constitutional.
WHY IT MATTERS Could call into question the tax status of many states’ municipal bonds.

Sprint/United Management Co. v. Mendelsohn
MENDELSOHN SAYS Her me-too witnesses (others allegedly treated the same) were unfairly kept from testifying in this age-discrimination suit.
SPRINT/U.M.C. SAYS At least five other federal appeals courts have found me-too witnesses irrelevant.
WHY IT MATTERS Could allow me-too witnesses in similar cases. 

Riegel v. Medtronic
RIEGEL SAYS Medical manufacturer Medtronic is responsible for his injuries from a ruptured balloon catheter.
MEDTRONIC SAYS It isn’t liable, because the device was approved by the F.D.A.
WHY IT MATTERS Could limit federal protection for manufacturers of F.D.A.-approved products.