Yah, it's sometimes used as a punchline, but there is a reason the word "allegedly" is used in news reports.

Some details are emerging about the Missouri player arrests:

The players told officers that after their 49-point home win over Texas-Pan American, they celebrated at a bar and then an after-hours party at an apartment. They said things got ugly at about 2 a.m., when Missouri cheerleader Justin Short got into a fight with his female roommate.

According to police, Hanneman and Johnson said Short physically restrained his roommate before they intervened. Johnson admitted pushing Short and Hanneman admitted “slapping and punching” the cheerleader, police said. The unnamed female roommate gave investigators a similar account.