The Washington Petition To Modify Custody Checklist For Scope of GAL-PI Investigation is a document used to establish the parameters of an investigation into modification of custody in Washington State. This document outlines the necessary steps that must be completed in order to investigate a modification of custody petition. It includes questions about the parties involved, the history of the relationship between the parties, the current circumstances, and the best interests of the children involved. The document also includes a list of topics that must be investigated, including financial records, school records, and mental health records. There are two types of Washington Petition To Modify Custody Checklist For Scope of GAL-PI Investigation: the short form and the long form. The short form includes only the essential information necessary for the investigation, while the long form includes additional questions for a more comprehensive investigation.