[A]lthough employment tests are often biased against minorities (National Research Council, 1989), employers who use them are more likely to hire minorities than employers who lack such tests (Neckerman & Kirschenman, 1991).  Testing may be biased, but the alternatives to testing are worse.

(From Chapter 18, “Interactions Between High Schools and Labor Markets,” by James Rosenbaum and Stephanie Jones)