I believe that most serious bowlers know that USBC rules prohibit the sanding of a bowling ball once competition begins. Rule 18 in the 2013-14 United States Bowling Congress rulebook states this:"Altering the surface of a bowling ball by the use of abrasives while bowling in USBC competition is prohibited. All bowling balls so altered must be removed from the competition." And it states this:"If it is shown the bowler had prior knowledge his/her actions were in violation of Rule 18, the...