The title of this post is actually rather misleading. The Associated Press is reporting that hundreds of National Guard troops will be deployed to New Orleans this next month as an anti-crime measure. So far as I know, martial law has yet to be declared.
Using soldiers to keep the civil peace has always been problematic. Troops equipped and trained to defeat another nation’s military are ill suited to arresting street gangs and investigating crimes. New Orleans mayor Ray Nagin and Louisiana governor Kathleen Blanco, the two politicians behind this decision, understand that well enough to emphasize that the NG troops will have “law enforcement experience”. The news article linked to above doesn’t mention which units will be used in NO, so there is no way to tell if they will confine themselves to using MP’s and refrain from having regular troops patrol the streets.