As a precaution, if a person isn't a parolee, staff also checks state, local and national sex offender registries, Kircher said.
WSJ: NY counties struggle with homeless sex offenders
"Fixing those buildings would cut our casualties in half, " said Dr Kircher.
BBC: NEWS | Science/Nature | San Francisco faces big shaker
Dr Kircher said that an important finding of the study was that vulnerable buildings - un-reinforced masonry, older reinforced concrete and "soft-storey" - made up less than 5% of all buildings in the region but would kill more than half the people.
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