The DeKalb County Sheriff's Office is the most recent addition to the U.S. Department of Homeland Security's Secure Communities Initiative.
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I started this map on the theory that counties would be more likely to adopt Secure Communities if they (a) bordered a county that was already participating or (b) were located on an interstate highway. Both are the case with DeKalb county.
DeKalb County also borders the state of Georgia and its northern tip appears to be within a few miles of Tennessee. Law enforcement jurisdictions that are located on interstates and near two (or more) other states face significant challenges.
See also: Alabama joins Secure Communities
UPDATE (November 15, 2011):
I've fallen behind in keeping track of the Alabama counties participating in Secure Communities. Thankfully ICE has provided an up-to-date resource for where Secure Communities is in place. Here's Alabama:
Here's the pdf with Secure Communities participation for each state.