Frotteurism: Sexual Assault or Accidental Encounter

You receive a dispatched call of a sexual assault at the train station, with no further details.  You answer up, as does your beat partner.  On scene a transit officer shows you the reporting party; a young, attractive woman, in her late twenties named Angie.  She reports that while she was on a crowded rush-hour train, a male rubbed against her rear-end with an erection.  She wants to press charges.  You are somewhat baffled.  There is either no suspect; or if there is a suspect he claims...
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