Read Christie Blatchford's recent article (link below) about an actual police investigation which concluded that an alleged sexual assault was unfounded. Note in particular the lack of cooperation by the complainant in not allowing the police to examine her cellphone which likely contained critical evidence that would show she was not telling the truth.

http://news.nationalpost.com/full-comment/christie-blatchford-again-a-mans-life-left-in-ruins-while-his-sexual-assault-accuser-goes-about-hers