MOBILE, Ala. -- Action movie star Steven Seagal is best known in these parts for having played the cook who thwarted a terrorist plot in the 1992 thriller "Under Siege," which was filmed here aboard the battleship USS Alabama. But these days he has another assignment. For almost 20 years, Seagal has been working as a fully commissioned reserve deputy with the Jefferson Parish Sheriff's Office in Louisiana. His law enforcement work is chronicled in a "Steven Seagal Lawman," an upcoming A&E reality TV show that will premiere on the cable channel at 9 p.m. CST Dec. 2. A&E is...