Why does Hiram call the Sheriff’s office and how does the deputy respond?

Hiram is disgusted by R.C.'s behavior and warns him not to do it again plus he has no intention of lying for R.C. who says that Emmett's family complained to the local sheriff. Hiram calls the local sheriff's office but he is told by one of the deputies that they do not have the time or the inclination to investigate this as the African American male is from Chicago and does not know the ways of the South. This alarms Hiram because he has figured out that the person in question is Emmett.