Just because they have to LOOK for family placement doesn't mean they must place the child there.
CPS is governed by statute and, likely, admin regs.
CPS workers have bosses. I'd be calling the agency and asking to speak with the caseworker's supervisor.
They told one foster mom (who I know) that
she could take her but only if she agreed to
adopt her at the conclusion of the
Without having ever practiced CP stuff, I think you could agree to that and refuse at the end. Moreover, most dependency situations result in reunification, I believe, which would eliminate the problem.