Duffy played a role in the 1980 ABSCAM scandal, in which numerous elected officials were targeted in an FBI sting operation, with agents posing as Arab businessmen offering bribes.
Duffy was the lead defense attorney for Louis C. Johanson, a member of the Philadelphia City Council who was sentenced to three years in prison.
[2] In 1981, Duffy defended one of the Maragos brothers who, along with four others, were accused of fixing the Pennsylvania lottery's daily number.
All of the Maragos brothers avoided jail time by agreeing to testify against the accused mastermind of the scam, Nick Perry.
[4] In 2009, Duffy was given the Osceola Wesley award by Chester County Drug Court his contributions to the "recovery of people gripped by addictive demons".