Answer to the unsigned IP comment: Clearly, you are not aware of what a biography page is or consist of.  A biography is supposed to reflect the whole person and his or her achievements.  A wikipedia page about a specific person whether it be an actor, politician, or athlete should mention all factual information in order to portray its accuracy.  I suspect that you are "concerned" with the heisman vote which is supposed to come up some time soon but I do not believe that his arrest will affect it whatsoever.  First, this is "NOT" recent news, the arrest was reported earlier this summer when Manziel was well known in the community.  Second, the "purpose that it serves" (to more properly answer your question) is nothing more than to inform the reader about information that is known about Manziel.  This information is a matter of public record and anyone can put it in wikipedia.  Your statement is akin to asserting that "discussing the Watergate Scandal serves no purpose on President Nixon's biography page."  Again, this is a flawed thought and belief.  Simply put, you don't get to "pick and choose" what goes on a biography. A biography reflects what a person has done whether it be positive or negative. Lastly, and equally significant, if you read the information that was posted, you will note that it is all FACTUAL.  There is no speculation as to whether this happened and the small paragraph condenses everything that a reader should know. 

 As a last remark, I went to an ACC school so we have bigger things to worry about.  This isn't a personal vendetta against Manziel, but it is a cause that I continue to fight for because it's precisely what Wikipedia stands for: A factual database, not an opinion forum.