Key words: sexual harassment; false allegations; investigations; lying A critical problem in both the epidemiology of sexual harassment and in administrative or legal inquires regarding allegations of sexual harassment is determining the truth of any allegation. Certainly, some cases are clear or at least sufficiently clear to render a decision with a fair degree of confidence, for example, when there are confessions, recordings of the acts, or reliable third party witnesses. Also, it is clearly the case that many acts of sexual harassment occur but are never reported. Moreover, it may be reasonable to stipulate that most sexual harassment allegations are true, that is, most people most of the time do not lie and can honestly report events, and there seems to be no exception in this domain of sexual harassment.However, resolving disputed allegations is complex as there are important and unresolved questions about the burden of proof, (i.e. the evidential standard someone must