That's a very good point: psychological testing is a powerful technology that has been around for almost a century, and its production is governed by strict ethics and protocols. Any high stakes test must be subjected to validation studies which can take many years, and will almost certainly require substantial refinements and alterations. Psychological testing can be very useful, but requires substantial training in order to be administered and interpreted correctly, for example the WAIS-R. Despite all this, testing abuse is rampant, especially in high stakes stiutations (think NCLB), and among gatekeepers in organizations (think HR morons), the latter of whom are usually low-rank administrative personnel and often lack the aptitude or motivation to be trained in proper test use. This is not to say that TSO's lack the aptitude or motivation to do proper BD, but rather that the potential for abuse is just as great as in other organizations, if not greater, given the apparent need to treat the testing technology as SSI.