There was a recent case (about a year or so ago) in Maryland, near Washington, of a teenager accusing her school sports coach of abuse. The DA prosecuted him and when it turned out that the girl had an ulterior motive where she was trying to hit at the coach and the accusation was a complete fabrication, the jury acquitted the coach.
The acquittal and proof of innocence unfortunately only came after the coach lost his job, reputation, and became known in the community as an abuser. Many times they are actually convicted and the innocence of the accused only comes out later after he is in prison for some time. In this case the only reason they were able to convince the jury to acquit, was because the girl confided in someone that she made up the story.