Just a little background:
Jefferson Parish is the suburban parish to New Orleans (which is entirely within Orleans Parish). Its a very large area that has a much larger population than New Orleans itself. Its mostly white suburban area, but the area he looks to be patrolling is "the westbank" which is on the other side of the River, and it is a mostly poor, Vietnamese and African-American area, with some trailer parks sprinkled in. Its pretty rough in some areas.
The Jefferson Parish police do not fuck around. At all. They kind of look like idiots on this show but they are, for the most part, a very efficient police force. And they don't give 2 fucks for civil liberties. They will profile like a motherfucker.
Seagal was deputized by the legendary Sheriff Harry Lee, a chinese-american that was Sheriff for 30 something years before he died just a couple of years ago. Harry Lee was in trouble with the ACLU, NAACP, etc all of the time, because he just did not give a fuck. He encouraged his officers to profile, to talk to anyone that looked like they "didn't belong" (ie black in a white neighborhood, etc). And the people in Jefferson Parish kept voting for him by like 90 something percent of the vote. He was one of those larger than life figures.
Seagal was around all of time and they were really buddy-buddy. I think if I remember correctly Seagal even "campaigned" for him one time.