Gambler into Foreign Substances?

Video replays show discoloration at the base of Detroit P Kenny Rogers' left thumb in the 1st inning of last night's game. Similar video footage from Rogers' two previous post-season starts (one against the Yankees and the other against the A's) showed Rogers had similar discoloration in the same spot during those games. Something is reproducible. Maybe he is able to put the pine tar on his hand in the same spot over and over. The scientific community would applaud the reproducibility. Or, maybe the way he grabs the rosin bag results in the same pattern each time he takes the mound.

I don't know what was on Rogers' hand, nor do I really care. Maybe it was dirt. Perhaps it was a foreign substance; apparently, most major league pitchers use pine tar (60-70% is a number I heard thrown around). And, if Rogers did use pine tar, or something similar, to help him grip the ball on a cold night, I don't have a problem with that. Baseball is a warm-weather sport played during the summer. I grew up in Alaska and I pitched when it was just above freezing, raining, and windy. By the end of the game, you can barely spread your fingers and every pitch is a palm ball because that's the only grip you can manage. Obviously, the elements weren't that adverse for Rogers, but let them use pine tar, or something else, if they are going to continue to schedule games in 30-40 degree weather.