If an examiner assumes that a person will lie in response to a control question, then wouldn't a DI be a slam dunk?  ???

Couldn't that examiner harass the examinee for lying and disqualify them if they so desired, knowing that in all probability the examinee lied on the control questions?

It seems like if they want to show that someone is a liar, they can do so if the examinee lies on the relevant OR the control questions. It seems like a no win situation...