San Francisco police arrested two men -- one is a UCSF psychiatrist.
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They're accused of possessing and even trading child porn.
Dr. Billy Lockhart and his roommate Benjamin Martin were arrested at their San Francisco apartment.
Neighbors didn't really know these men since they moved in just three months ago. Inside their apartment, police say they found more than a thousand files of child pornography.
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Police believe Lockhart gathered the child porn on campus before bringing it home.
One UCSF patient worries Lockhart has access to children. "It's sad. It's sad that so many people are obsessed with these kinds of things," said Annette Boysan.
UCSF has placed Lockhart on investigatory leave and suspends his clinical activity and access.