It's sister tool which also comes in the package, FlexCPD, detects copy/paste code which might seem 'suspect' utilising the JavaCPD engine to detect such duplications. Upon running these tools, you get a detailed report in XML or charted via Hudson/Sonar, to assist in finding the code, realising the trends and so forth.
Installing/Setting up FlexPMD
You set up FlexPMD by following the instructions set here.
Creating Rules
To create rules you would use the FlexPMD RuleSet creator which is in fact a Flex App,
Outputting Results
You output the results using the Violation Viewer.

(courtsey of video-flash.de)

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