Major League Baseball sent a memo to all 30 teams on Saturday detailing the rigorous testing process its baseballs undergo, and concluding that "there is no evidence that the composition of the ball has changed in any way."

There has been rising suspicion regarding balls this season as home runs are being hit at a record rate.

The memo came in the wake of a report that 12 players, coaches and managers strongly believe in a production flaw or other intervention to possibly stimulate home runs.

Players are set to far surpass the home run record set in 2000, the height of the so-called steroid era.

The memo notes that balls are tested at the University of Massachusetts-Lowell Baseball Research Center at least three times a year. Those tests measure the ball's size, weight and bounciness, seam height, circumference and weight.