A new study on retractions shows that the system is effective for alerting the community to invalid work. The Scholarly Kitchen discusses an article ("Governing knowledge in the scientific community: Exploring the role of retractions in biomedicine“ pub in Research Policy, March 2012 by, J Furman, K Jensen, and F Murray) that reports on a study of 677 article retractions identified in MEDLINE between 1972 and 2006.