What can I do to keep my wife from taking our son out-of-state?

Question Details:

I am working to attain sole custody. Right now my son's mother has assumed custody since no legal action has taken place since our separation. Due to circumstances of having no legal power, I have seen my son less and less. I was told by many friends that I could start by filing for sole custody because I am afraid that she may flee with our son. What can I do to keep her from leaving so that this matter can be settled here in Hawaii?

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