It's a pretty common (though not universal) legal precedent that sexual relations between a law enforcement official and someone they are detaining is rape, by definition.

Of course that could be argued. Much as they often do with the more commonly known form of statutory rape (the one that involves minors) people can attempt to claim that there are exceptions to this rule, and that some version of consent is possible despite the situation.

I would disagree. Presumably the writer of this article does as well.