PHILADELPHIA — If you're weighing in on or merely contemplating the story of Sha'Carri Richardson — the 21-year-old sprinter who won the 100-meter dash at the U.S. Olympic Trials only to be disqualified, because of a positive marijuana test, from competing in the event at the Summer Olympics in Tokyo this month — it's probably a good idea to keep one name in mind: Steve Martin. Back in the late 1970s, when he was America's hottest standup comedian, picking a banjo and wearing a fake arrow through his head, Martin would joke that he had a surefire way to reduce crime throughout the country: "de...