AbleCommerce Shopping Cart Software

We have pretty airtight terms and conditions, and there is no need to accept it upon every checkout, just the first time suffices. How would I go about referencing that a customer has checked accept before, and then hiding that upon all subsequent checkout?

One possibility is to update checkout code so that when ever some customer accepts terms and conditions and completes the checkout you add new user setting for him with some info in it to keep track that he/she has accepted the terms. Then you can update code that shows terms and conditions so that first it should look for user setting and if its not available then it should show them otherwise simply skip it.