One means to address the matter is to require APA formatted essays.
Another, more resource intensive endeavor, is timed essays within the campus. You could monitor their website activity if you allow the use of references. Either way, you eliminate their unmonitored use of the internet.
The PMP certification exam when performed online requires your exam area to be inspected remotely. Also you are required to take your exam monitored. Proctors if they suspect you of cheating can allow you to complete the exam and fail you or just cut the feed to the exam.
There are options available for colleges. The effort is where you don’t have resources applied to deal with chat gpt unfortunately.
RE: ChatGPT vs. University Professors -- Not a Fair Fight (Not Even Close)