If recent history is any guide, the one sure thing to follow from recent mass arrests on the Brooklyn Bridge during the height of the Occupy Wall Street protests is prolonged litigation in federal court.

More than seven years after the Republican Party renominated George W. Bush in New York City and almost three years after Mr. Bush retired to Texas, the city’s Law Department is still working hard to defeat class and individual actions alleging the police were guilty of widespread violations of the U.S. Constitution in the mass arrest and detention of almost 1,800 demonstrators at the GOP’s 2004 convention.