An Affidavit of Due Diligence is a detailed report explaining the exhaustive efforts taken to locate a specific person (often a defendant or heir).
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Before a court allows alternative service methods like publication, the plaintiff must prove they tried everything reasonable to find the person first.
This affidavit lists specific actions: searching telephone directories, checking voter registration, contacting the post office for forwarding addresses, searching social media, checking with known relatives, and visiting last known addresses.
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