Landis v. Selig: honor code v. none.

Before 1920 if one player approached another player to throw a contest, there was a very good chance he would not be informed upon. Now, there was an excellent chance he would be turned in. No honest player wanted to meet the same fate as Buck Weaver ... Without the forbidding example of Buck Weaver to haunt them, it is unlikely Mann and Sand would have snitched on their fellow players. After Landis' unforgiving treatment of the popular and basically honest Weaver they dared not to. And once prospectively crooked players knew that honest players would no longer shield them, the scandals stopped.

Pietrusza, David (1998). Judge and Jury: The Life and Times of Judge Kenesaw Mountain Landis. South Bend, Indiana: Diamond Communications. ISBN 978-1-888698-09-1. page 194
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Kenesaw Mountain Landis handled the betting scandal much differently than Bud Selig handled the performance enhancing drugs (PED) scandal. Landis imposed an honor code. Selig did not.

Buck Weaver