Umpire Requires Cardinals Pitcher to Remove Rosin Bag Residue Twice

St. Louis Cardinals relief pitcher Giovanny Gallegos had to wipe rosin off his left arm after an umpire noticed him applying it, which is against the rules.
Gallegos repeated the action, leading the umpire to wipe his arm again and remind him that pitchers can only use rosin on their throwing arm.
Gallegos claimed he did it unconsciously out of habit and that it's common for pitchers to do.
This isn't the first time Gallegos has had to deal with umpire scrutiny - previously, he had to switch caps due to a suspicious substance that ended up just being sunscreen.
The umpire's crew chief later clarified that rosin is allowed on the throwing hand and arm but not the glove hand.