Given the scrutiny of professional and high-level amateur athletes in the age of performance-enhancing drugs, many fans wonder why the 13 baseball players suspended Monday thought they could get away with doping.

The answer, unfortunately, is because they can get away with it.

Major League Baseball Commissioner Bud Selig suspended Alex Rodriquez through the 2014 season and 12 other players for 50 games each, due to their involvement with the Biogenesis lab in Miami. Milwaukee Brewers' star Ryan Braun already is serving a 65-game suspension.

None of those players tested positive for banned substances, however. Rather, local investigative journalism and an aggressive investigation by Mr. Selig's office - both exploiting a bitter, failed business relationship at the lab - produced extensive records that led to the suspensions.

The real turning point in these cases is the cooperation of most of the players themselves and the Major League Baseball Players Association, the players' union. With the exception of Mr. Rodriquez, they worked with the commissioners' office on settlements rather than filing grievances. And many players who have not used performance-enhancing drugs bluntly condemned those players who had cheated.

So the suspensions are a turning point. But until testing becomes as sophisticated as doping, it will be a triple rather than a home run.