The custody rating scale has been validated for women on more than one occasion, but we recognize that it was a tool developed with primarily a male sample. Ideally, tools are developed for women from the ground up. In the past, we have attempted to add predictive accuracy to the custody rating scale but with no luck.
In short, part of the reason is that it is the initial tool. We get offenders, inmates, coming in whom we don't know at all. It has to rely on static risk factors, things like the length of their sentence, their age, or whether they have violence in their history, because we don't know them well enough at the point of entry to be able to fully assess their needs on the day they come in.