At the company I currently work at we are detecting people that take a very simple take home test, then they go on to use chatgpt and proceed to not be able to

At the company I currently work at we are detecting people that take a very simple take home test, then they go on to use chatgpt and proceed to not be able to explain why "they" solved the problem that way. Also people sending a barebnes chatgpt cover letter when it is optional to do so.