3Qs: Sports under a microscope of suspicion

The winner of the 98th Tour de France will be crowned on Sunday in Paris. But the event has been tainted by ongoing alle­ga­tions of blood doping and the use of performance-​​enhancing drugs by cycling’s top per­formers. We asked Dan Lebowitz, exec­u­tive director of Sport in Society, a North­eastern Uni­ver­sity research center, to ana­lyze the impact of such illegal prac­tices in pro­fes­sional sports.