“We did not [originally] document or confirm whether or not they were citizens or aliens here legally...Because of the new law, we are now going through the process to confirm that they are either a citizen or an alien here legally.”
Sounds to me like they are checking up on all of their existing customers to me.
That seems more ambiguous than the other statement I quoted. It can be read to mean that they are checking new customers now where they didn’t used to do that.