Why a professional licence does not cross state lines
A licence is granted by a state, and crossing a state line does not carry it with you. Several mechanisms soften that, and none is automatic.
Licences are issued by state boards against that state's requirements, so the same occupation can require different education, examinations and supervised hours in different places. A licence is permission to practise in the issuing state and nowhere else by default.
Reciprocity agreements let some states accept another's licence directly. Endorsement is more common: the new state reviews your existing licence and issues its own if its requirements are met, sometimes after an additional examination on that state's law.
Interstate compacts now cover several occupations, particularly in healthcare, and allow practice across member states under one privilege. Which states have joined changes, and the compact's own site is the current authority.
The timing is the practical problem. Processing can take months, and starting after a move means a gap in earnings. Boards accept applications from out of state, so beginning before the move is usually possible and almost always better.
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