Section 260.40 - When are these provisions in effect?(a) In determining whether a State is subject to a penalty under parts 261 through 265 of this chapter, we will not apply the regulatory provisions in parts 260 through 265 of this chapter retroactively. We will judge State actions that occurred prior to the effective date of these rules and expenditures of funds received prior to the effective date only against a reasonable interpretation of the statutory provisions in title IV-A of the Act.(b) The effective date of these rules is October 1, 1999.