WA Statutory Declaration for Family Law Visitation

What you'll need to do is file consent orders with the court. No other documents will be enforceable by the court where parenting matters are concerned. You can find some more information here: Kits

Even though WA hasn't referred it's powers in family law to the federal court, I'm quite certain that state police are unable to intervene to ensure the enforcement of consent orders because it's a civil matter. If either party contravenes the orders, the other party can apply for a contravention order through the court.

Hope this helps.