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If both parents are taking drugs and this is a factor for the court and the other parent is making it an issue, he could ask the court for both parties to submit to a drug test and that might make it an even playing field. If he doesn't have an attorney, he should retain a good family law attorney. If they can't agree to a parenting plan then this attorney will be worth his/her weight in gold.
Under Washington State child custody laws, judges who sign off on a couple’s divorce must consider the best interests of the child as the guiding principle in deciding custody issues. Even if both parents agree to a custody arrangement, the judge will review it and make sure it is in the children’s best interests.
In determining what is in the best interests of the children, the judge will look at each parent’s ability to:
(1) maintain a loving, stable relationship with the children
(2) Provide for the children’s basic needs, such as feeding, clothing, physical health, grooming, health care, day care, etc.
(3) Be involved with the educational needs of the children
(4) Exercise sound judgment
(5) Financially support the children
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