All our surveys ask for a Client ID. We have recently added a question to our surveys that asks whether someone is completing an entry, follow-up or exit survey.
Is it possible when someone chooses “follow-up”, that the Client ID entered in the current survey is checked against Client IDs in all previous surveys to ensure that the Client ID has responded to the survey before?
It can be done using custom scripting.
This page has an example that is fairly similar to what I think you want to achieve: