Most schools will require a final transcript from accepted students. I imagine it's pretty rare for an offer to be rescinded, unless you let your grades drop a lot. It isn't wise to allow this to happen, though, as you will likely have instances in law school where you're going to have to provide an undergrad transcript.
In the extremely likely chance that I go, I'll make a thread closer to the date and we'll get something organized for sure. So excited to meet the people I'll be spending the next 3 years in the trenches with!