What we have done is hire a law firm, one that is involved in the design/construction industry, who then assigns a paralegal to review the requirements of each state. It is expensive and not that convincing.
Frankly, the best approach is to simply have a policy to contact the license board in each state and the state department of each state and ask the question whenever you think you may become involved with work in that state. Don't forget that in many states it is illegal to pursue work if not licensed in that state. Also, the continuing education requirements from state to state vary. New York, for example, requirers that most of the credits earned come from "formal" presentations, which means a live presenter. (NCARB Monographs, which are excellent, don't count but a brick salesman's presentation on proper flashing does!)
This issue represents a major failure on the part of the AIA and NCARB. There is no reason why these organizations can't provide leadership on this issue and coordinate the requirements of each state. Of course, if they do we can expect to pay for that along with the fees required from each state.
-------------------------------------------
Francis Watkins AIA
Bignell Watkins & Hasser Architects, P.A.
Annapolis MD
-------------------------------------------