Yes, seeking to depose the GAL and treating the GAL as a expert witness would be an option if you need to gather information and evidence against the GAL to be able to impeach their credibility unless you already have your own actual evidence needed to impeach the GAL. If you already have such evidence to be able to impeach her credibility, then you can save money deposing her and you would simply call her as a witness on the stand and get her to testify and then present the evidence you already have to show the court she is lying.
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