Last night, San Francisco Giants pitcher Tim Lincecum threw eight innings of one run baseball, racking up 10 strikeouts in the process, and leading the Giants to their first World Series victory since moving to San Francisco at the end of the 1957 season. Why am I writing about this on the MPP blog? Because Lincecum, a former Cy Young Award winner, is one of the millions of Americans who has used marijuana and been subjected to the criminal justice system for using a substance less harmful than alcohol.…