Rejecting a Job Applicant based on their Credit Score - Discrimination?

Is rejecting a job applicant based on a credit score discrimination? Credit Slips says yes.

From the New York Times, Another Hurdle for the Jobless: Credit Inquiries:

More than 40 percent of employers use credit checks at least sometimes, according to a 2004 survey by the Society for Human Resource Management, up from 25 percent in 1998.

and this lovely assumption from employers:

Business executives say that they have an obligation to be diligent and to protect themselves from employees who may be unreliable, unwise or too susceptible to temptation to steal, and that credit checks are a help.

From Credit Slips: