Since the U.S. Supreme Court overturned a national ban on sports gambling, many states have rushed forward to legalize the practice. Full-scale sports gambling is now permitted in six states. More than 20 other states and the District of Columbia are on their way.
But a degree of caution is in order. Legalized gambling is likely to attract billions of additional dollars into the sports market. Most will be legitimate. But some will be of unknown, perhaps criminal, provenance.