Hide opt-in box on forms based on database value

[Anna-Lena_Westr]

hi, it would be great if it would be possible that if a contact has submitted a web form and opted-in and when that same person returns and wants to submit another web form Marketo will check whether they have already opted-in in the past the opt-in box will not be displayed anymore. I know this is possible if a contact / person clicks on a link in an email which redirects to a landing page. 

[Katja_Keesom]

If you use a mirror opt-in field storing a "copy" of the original opt-in you can make that work with field visibility rules.

Of course, having as a standard feature would be nice, but it is not all that difficult to set up with existing functionality.