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SAN FRANCISCO - JANUARY 27:  The San Francisco skyline is seen behind the north tower of the Golden Gate Bridge January 27, 2005 in San Francisco. A controversial film made by moviemaker Eric Steel documenting people committing suicide off of the Golden Gate Bridge has opened a debate about why there isn't a suicide barrier on the famous landmark. Over 1,300 people have jumped to their death from the span since the bridge opened in 1937. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO - JANUARY 27:  The San Francisco skyline is seen behind the north tower of the Golden Gate Bridge January 27, 2005 in San Francisco. A controversial film made by moviemaker Eric Steel documenting people committing suicide off of the Golden Gate Bridge has opened a debate about why there isn't a suicide barrier on the famous landmark. Over 1,300 people have jumped to their death from the span since the bridge opened in 1937. (Photo by Justin Sullivan/Getty Images)

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The term "sanctuary city" isn't a legal or legislative designation, but something else entirely. CNN's Nick Valencia reports.