(a) Except as provided in Chapter 1 (commencing with Section 7540) and Chapter 3 (commencing with Section 7570) of Part 2 or in Section 20102, a presumption under Section 7611 is a rebuttable presumption affecting the burden of proof and may be rebutted in an appropriate action only by clear and convincing evidence. (b) If two or more presumptions arise under Section 7610 or 7611 that conflict with each other, or if a presumption under Section 7611 conflicts with a claim pursuant to Section 7610, the presumption which on the facts is founded on the weightier considerations of policy and logic controls. (c) The presumption under Section 7611 is rebutted by a judgment establishing paternity of the child by another man.
