[yummyfajitas]

We've got lots of great techniques that apply in specific cases. Work sample tests and intelligence tests (admittedly illegal in the US), for example - tokenadult has a long linkdump that backs this up. If I recall right, tptacek has also done this in practice and had it work excellently.

Further, even if you can only systematize part of the process, that still helps you debug. If women all get rejected on the (blind) coding test then you don't need to waste time looking for bias. If women get rejected at the culture fit interview then you might want to look for bias at that stage.