OLYMPIA, Wash. -- The parents of missing Utah mother Susan Powell are pushing for changes in how Washington state law handles custody cases.

A proposal in the state Senate would restrict or block visitation rights for someone who is the subject of a murder investigation. Chuck and Judy Cox said Friday they believe the legislation could have changed the course of an investigation that ultimately led to Josh Powell killing himself and his two young kids.

Authorities in Utah had long been examining Powell in the 2009 disappearance of his wife. Powell killed his children last year when they arrived at his home for a supervised visit.

Utah investigators never publicly declared Powell a suspect but treated him as one privately. The proposed law would allow people involved in custody cases to demand information from law enforcement that might be relevant to decisions on visitation matters.

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