Nine days after being released early from the Placer County jail because of overcrowding, medical marijuana activist Steven Wynn Kubby is returning for another stay. Kubby, 59, will report to jail today to serve a 60-day sentence imposed Tuesday by Superior Court Judge Robert McElhany, who determined that Kubby violated probation when he moved to Canada in 2001 to avoid a 120-day term for a drug conviction.