Oh by the way two books I found of interest, in my limited research are as follows:

Law and Violence in Virginia and the Carolinas. Sally E. Hadden Harvard University Press.(2001)


The Slave Catchers: Enforcement of the Fugitive Salve Law, 1850-1860. Stanley W. Campbell Chapel Hill: University of North Carolina Press. (1970)

our local university library as both.

and a film of interest is:

Unchained Memories - Readings from the Slave Narratives (2002)