For a professional sports league with the most restrictive replay procedure, Major League Baseball has certainly found ways to stir up controversy with its use of the technology.
The MLB instant replay guidelines specify that instant replay only applies to so-called boundary calls: "whether [potential home runs] are fair or foul, whether they have left the playing field, or whether they have been subject to fan interference. The decision to use instant replay will be made by the umpire crew chief, who will also make the determination as to whether or not a call should be reversed."
Fairly straightforward, right? Wrong.
Throughout the 2011 season, MLB's instant replay review has had a way of attracting criticism, and this doesn't even include the heated arguments on both sides over the issue of expanding MLB's foray into instant replay review.
Here are the five most controversial uses of instant replay review that occurred during the 2011 season.