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In Raleigh, N.C., employees of Capitol Special Police patrol apartment buildings, a bowling alley and nightclubs, stopping suspicious people, searching their cars and making arrests.
Sounds like a good thing, but Capitol Special Police isn't a police force at all -- it's a for-profit security company hired by private property owners.
This isn't unique. Private security guards outnumber real police more than 5-1, and increasingly act like them.
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This trend should greatly concern citizens. Law enforcement should be a government function, and privatizing it puts us all at risk.
Most obviously, there's the problem of agenda. Public police forces are charged with protecting the citizens of the cities and towns over which they have jurisdiction. Of course, there are instances of policemen overstepping their bounds, but these are exceptions, and the police officers and departments are ultimately responsible to the public.
Private police officers are different. They don't work for us; they work for corporations. They're focused on the priorities of their employers or the companies that hire them. They're less concerned with due process, public safety and civil rights.
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http://www.schneier.com/blog/archives/2007/02/private_police.html