"Even before DSM-V was released, the American Journal of Psychiatry published the results of validity tests of various new diagnoses, which indicated that the DSM largely lacks what in the world of science is known as "reliability"-- the ability to produce consistent, replicable results. In other words, it lacks scientific validity. Oddly, the lack of reliability and validity did not keep the DSM-V from meeting its deadline for publication, despite the near-universal consensus that it represented no improvement over the previous diagnostic system. Could the fact that the APA had earned $100 million on the DSM-IV and is slated to take in a similar amount with the DSM-V (because all mental health practitioners, many lawyers, and other professionals will be obliged to purchase the latest edition) be the reason we have this new diagnostic system?"
(The Body Keeps The Score, 2014. Van Der Kolk, page 166, 167)