OmarAdnan

If you use any sort of list, it’s technically a violation. To not violate the standard, you need to recall every client by memory and then, re-obtain their contact information in some way that is not related to your old company.
But of course, if you do take the list or keep the business cards, no one will ever know, it does not hurt anyone other than your old employer, and I doubt that CFAI will even care.