Harkin is a corrupt human police officer of C-Sec in Mass Effect. Captain Anderson describes him as a "disgrace to the species" due to his illegal and crooked activities such as roughing up suspects, taking bribes, and abusing alcohol and drugs. Harkin is confronted by Commander Shepard at Chora's Den in order to find Garrus. In the sequel, he is confronted in Garrus' loyalty mission where he is helping Sidonis escape in the Terminus Systems. Harkin is foiled and, as mentioned by EDI, is placed under arrest by C-Sec for his crimes.