Technically, President Grant got pulled over, and taken into custody, in 1872 for “speeding on a horse within the city limits of Washington DC.” It was the third such ticket he was given in his life, the first two being in the early part of the 1860s when he was just a General. The cop tried to let him go, and Grant cited section 1983 of the federal code that had been passed a few months previously in 1871 that stated unequivocally that no one is above the law, not even a sitting president.