This is one of the practical limits of the Turing Test as usually proposed - the parties could just refuse to jump through the hoop of writing an essay, and tha

This is one of the practical limits of the Turing Test as usually proposed - the parties could just refuse to jump through the hoop of writing an essay, and that would be a perfectly normal reaction. In practice, attempts to pass the Turing Test have leaned heavily on hand-coded strategies for changing the subject and feigning refusal to co-operate, with some success - for example https://en.wikipedia.org/wiki/Eugene_Goostman https://en.wikipedia.org/wiki/Eugene_Goostman