A formula for detecting faked Raven's SPM profiles was cross-validated on 44 children and adolescents (ages 7-17). It yielded a false negative rate of 64%. However, a rule using three very easy items (i.e., any of A3, A4 or B1 missed) yielded a hit rate of 95%, with 5% false positive and negative rates. All but two of the participants were able to produce lower scores when asked to fake the test.