3011. In making a determination of the best interest of the child in a proceeding described in Section 3021, the court shall, among any other factors it finds relevant, consider all of the following:

• (a) The health, safety, and welfare of the child.
• (b) Any history of abuse by one parent or any other person seeking custody against any of the following:
  • (1) Any child to whom he or she is related by blood or affinity or with whom he or she has had a caretaking relationship, no matter how temporary.
  • (2) The other parent.
  • (3) A parent, current spouse, or cohabitant, of the parent or person seeking custody, or a person with whom the parent or person seeking custody has a dating or engagement relationship.

  As a prerequisite to the consideration of allegations of abuse, the court may require substantial independent corroboration, including, but not limited to, written reports by law enforcement agencies, child protective services or other social welfare agencies, courts, medical facilities, or other public agencies or private nonprofit organizations providing services to victims of sexual assault or domestic violence. As used in this subdivision, “abuse against a child” means “child abuse” as defined in Section 11165.6 of the Penal Code and abuse against any of the other persons described in paragraph (2) or (3) means “abuse” as defined in Section 6203 of this code.

• (c) The nature and amount of contact with both parents, except as provided in Section 3046.
• (d) The habitual or continual illegal use of controlled substances or habitual or continual abuse of alcohol by either parent. Before considering these allegations, the court may first require independent corroboration, including, but not limited to, written reports from law enforcement agencies, courts, probation departments, social welfare agencies, medical facilities, rehabilitation facilities, or other public agencies or nonprofit organizations providing drug and alcohol abuse services. As used in this subdivision, “controlled substances” has the same meaning as defined in the California Uniform Controlled Substances Act, Division 10 (commencing with Section 11000) of the Health and Safety Code.
• (e)
  • (1) Where allegations about a parent pursuant to subdivision (b) or (d) have been brought to the attention of the court in the current proceeding, and the court makes an order for sole or joint custody to that parent, the court shall state its reasons in writing or on the record. In these circumstances, the court shall ensure that any order regarding custody or visitation is specific as to time, day, place, and manner of transfer of the child as set forth in subdivision (b) of Section 6323.
  • (2) The provisions of this subdivision shall not apply if the parties stipulate in writing or on the record regarding custody or visitation.

3020.

• (a) The Legislature finds and declares that it is the public policy of this state to assure that the health, safety, and welfare of children shall be the court’s primary concern in determining the best interest of children when making any orders regarding the physical or legal custody or visitation of children. The Legislature further finds and declares that the perpetration of child abuse or domestic violence in a household where a child resides is detrimental to the child.
• (b) The Legislature finds and declares that it is the public policy of this state to assure that children have frequent and continuing contact with both parents after the parents have separated or dissolved their marriage, or ended their relationship, and to encourage parents to share the rights and responsibilities of child rearing in order to effect this policy, except where the contact would not be in the best interest of the child, as provided in Section 3011.

3040.

• (a) Custody should be granted in the following order of preference according to the best interest of the child as provided in Sections 3011 and 3020: (1) To both parents jointly pursuant to Chapter 4 (commencing with Section 3080) or to either parent. In making an order granting custody to either parent, the court shall consider, among other factors, which parent is more likely to allow the child frequent and continuing contact with the noncustodial parent, consistent with Section 3011 and 3020, and shall not prefer a parent as custodian because of that parent’s sex. The court, in its discretion, may require the parents to submit to the court a plan for the implementation of the custody order. (2) If to neither parent, to the person or persons in whose home the child has been living in a wholesome and stable environment. (3) To any other person or persons deemed by the court to be suitable and able to provide adequate and proper care and guidance for the child.
• (b) This section establishes neither a preference nor a presumption for or against joint legal custody, joint physical custody, or sole custody, but allows the court and the family the widest discretion to choose a parenting plan that is in the best interest of the child.

3042.

• (a) If a child is of sufficient age and capacity to reason so as to form an intelligent preference as to custody, the court shall consider and give due weight to the wishes of the child in making an order granting or modifying custody.

3044.

• (a) Upon a finding by the court that a party seeking custody of a child has perpetrated domestic violence against the other party seeking custody of the child or against the child or the child’s siblings within the previous five years, there is a rebuttable presumption that an award of sole or joint physical or legal custody of a child to a person who has perpetrated domestic violence is detrimental to the best interest of the child, pursuant to Section 3011. This presumption may only be rebutted by a preponderance of the evidence.