A New Jersey judge has ruled that prosecutors may no longer use the three-decade-old psychological theory commonly used to attempt to prove child rape allegations.

Hudson County Superior Court Judge Peter Bariso on Sept. 1, acting on a remand from the Supreme Court, ruled that judges should not allow prosecutors to admit “child sexual abuse accommodation syndrome” (CSAAS) evidence as expert testimony in such cases.

As of Wednesday, it was not immediately clear how many cases could be affected, since CSAAS evidence has been widely accepted for years in hundreds of cases.