This is being discussed on a Facebook umpire forum ...... http://nypost.com/2015/10/28/royals-catchers-mystery-shinguard-substance-raises-questions/ http://espn.go.com/mlb/story/_/id/13995085/2015-world-series-terry-collins-ned-yost-defend-kansas-city-royals-catcher-salvador-perez-use-pine-tar-shin-guard http://www.newsday.com/sports/baseball/substance-on-royals-c-salvador-perez-s-shinguard-is-legal-1.11023749