""Our present policy provides that if the List of Conforming Golf Balls or the One Ball Condition is in effect, a practice or logo ball may be used provided the other markings on the ball (i.e., pole and seam) correspond exactly to a ball listing on the current List of Conforming Golf Balls. Balls labeled with “PRACTICE” or a circled “P”, are essentially treated as a logo ball (such as a Mickey Mouse emblem). A player's name stamped on the ball is also acceptable. However, the original ball markings (i.e., pole and seam markings) must be readable in order for a Rules Official to determine whether that ball is on the List of Conforming Golf Balls. X-Out balls are not permitted to be used in any competition in which the List of Conforming Golf Balls or the One Ball Condition is in effect. However, if neither of these Conditions are in effect, X-Out balls may be used because all balls are presumed to conform unless they have been tested and found not to conform or are obviously non-conforming (e.g., too small or too heavy).""
