This is the second of a two-part column. The first part was published on Monday.A 70-year-old line of precedent based on the public policy of the False Claims Act, or FCA, stymied Champion Fitness and Jeff Schade’s counterclaims against Barbara Morgan, a qui tam plaintiff who used to handle Medicare billing for the defendants.Morgan reportedly received a percentage (originally 6%; later 7.5%) of what the defendants …