How much of an issue has applicants using AI during interviews been?

I'm developing a new technical interview process, and I'm wondering how much I should be concerned about applicants potentially trying to use ChatGPT etc during the interview. They are case study/syst

I'm developing a new technical interview process, and I'm wondering how much I should be concerned about applicants potentially trying to use ChatGPT etc during the interview. They are case study/system design type questions, and we would provide any information they need, so there is no reason to be Googling or otherwise online during the interview. This will be done over Zoom. I'm sure I'll be able to tell if this happens, but I'm wondering how much I need to prepare for it. This is for a mid level position. EDIT: These are not Leetcode or memorization questions. Applicants are not expected to write code from scratch. EDIT 2: Well, I'm convinced. This is a real issue.