FAM §3030.5: (a) Upon the motion of one or both parents, or the legal guardian or custodian, or upon the court’s own motion, an order granting physical or legal custody of, or unsupervised visitation with, a child

(a) Upon the motion of one or both parents, or the legal guardian or custodian, or upon the court’s own motion, an order granting physical or legal custody of, or unsupervised visitation with, a child may be modified or terminated if either of the following circumstances has occurred since the order was entered, unless the court finds that there is no significant risk to the child and states its reasons in writing or on the record: (1) The person who has been granted physical or legal custody of, or unsupervised visitation with the child is required, as a result of a felony conviction in which the victim was a minor, to be registered as a sex offender under Section 290 of the Penal Code. (2) The person who has been granted physical or legal custody of, or unsupervised visitation with, the child resides with another person who is required, as a result of a felony conviction in which the victim was a minor, to be registered as a sex offender under Section 290 of the Penal Code. (b) The fact that a child is permitted unsupervised contact with a person who is required, as a result of a felony conviction in which the victim was a minor, to be registered as a sex offender under Section 290 of the Penal Code, shall be prima facie evidence that the child is at significant risk. When making a determination regarding significant risk to the child, the prima facie evidence shall constitute a presumption affecting the burden of producing evidence. However, this presumption shall not apply if there are factors mitigating against its application, including whether the party seeking custody or visitation is also required, as the result of a felony conviction in which the victim was a minor, to register as a sex offender under Section 290 of the Penal Code. (c) The court shall not modify an existing custody or visitation order upon the ex parte petition of one party pursuant to this section without providing notice to the other party and an opportunity to be heard. This notice provision applies only when the motion for custody or visitation change is based solely on the fact that the child is allowed unsupervised contact with a person required, as a result of a felony conviction in which the victim was a minor, to register as a sex offender under Section 290 of the Penal Code and does not affect the court’s ability to remove a child upon an ex parte motion when there is a showing of immediate harm to the child.