The U.S. Constitution at Article IV, Section I, states: …

“Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State.  And the Congress may by general Laws prescribe the Manner in which such Acts, Records...

Texas allows “nonresident attorneys” to appear for a single case–commonly referred to as pro hac vice–but makes the process a bit more onerous than other jurisdictions.

Rule 19 of the Rules Governing Admission to the Bar of Texas establishes the procedure for a nonresident attorney to request permission...