Look, I've done a lot of interviews as the interviewer. This attitude that we have to design processes as if there are five hundred quintillion octillions of googolplexes of novemdecillions of cheating lying "fake coders" for every one qualified person is not rooted in reality, nor is the level of paranoia you're displaying. There are perfectly reasonable processes you can use which will catch a cheater if you actually get one. But designing a process entirely around the assumption that everyone is a cheater trying to lie their way into your company is just not useful.