She and her colleague Katherine Jackson also used garbology as a teaching aid, in which students would bring in waste bins from their rooms. Other students, who didn"t know to whom the rubbish belonged, would then pick through it and try to infer what sort of person had thrown those particular things away. Damron-Martinez says she was constantly surprised at how revealing the process could be. She recalls a case in which one subject"s girlfriend had added her own rubbish to the bin without his knowledge.