45 CFR 12a.15: a.15 Severability.

Any provision of this part held to be invalid or unenforceable with respect to certain parties or circumstances shall be construed so as to continue to give the maximum effect to the provision permitted by law unless such holding is that the provision of this part is invalid and unenforceable in all circumstances, in which event the provision shall be severable from the remainder of this part and shall not affect the remainder thereof.