Are there any plagiarism detection tools at Columbia?

Yes, Columbia's IT department subscribes to turnitin.com.  More information about this service see their web page at: 

http://services.cuit.columbia.edu/plagiarism-detection-services

See also this posting from our blog: 

http://ccnmtl.columbia.edu/enhanced/solutions/student_heal_thyself_with_turnitin.html

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