McKinzey, R. K. (2005, May 15). The Rorschach's false positive rate is 81%. WebPsychEmpiricist. Retrieved (date) from http://wpe.info/papers_table.html
Two different studies sent normal Rorschach protocols to qualified psychologists. They found that over 80% of the psychologists misidentified the normal protocols as showing severe psychopathology. Using the Comprehensive System did not improve the false positive rate, which stands as 81%. The two studies are described in detail, and their result tables reproduced. This review is necessary since one study is a dissertation not readily available, and my citation of it elsewhere has been challenged.