If rosin is used to doctor baseballs, why is it legal?
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/cdn.vox-cdn.com/uploads/chorus_image/image/16142943/burnett.0.png "A.J. Burnett's rosin bag explodes again - SBNation.com")
A.J. Burnett's rosin bag explodes again - SBNation.com
The use of rosin bags by pitchers came about, at least in part, to combat skullduggery. - CSMonitor.com
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