28 Miss. Code. R. 301-19.8
Vehicles displaying the MSPA decal on their windshields are acknowledged to having official business on the Premises but are still required to possess a TWIC card and are subject to searched upon entry. Law enforcement officials at the State and Local levels are not required to possess a TWIC card to gain unescorted access to Restricted/Secure areas at the Port of Gulfport.
First Responders at the State or Local levels are not required to possess a TWIC in order to gain unescorted access to Restricted/Secure areas during an emergency situation. They may, however, voluntarily obtain a TWIC where their offices fall within or where they desire frequent unescorted access to a restricted/secure area of a vessel, facility in a non-emergency situation.
28 Miss. Code. R. 301-19.8