Give me a detailed overview of the missing persons and human trafficking landscape in the United States. Include the most recent statistics on missing persons and trafficking cases. Then explain the differences between public sector (law enforcement, federal agencies) and private sector (private investigators, nonprofits, security contractors) involvement in recovery efforts. Also outline how missing persons investigations are typically funded in both the public and private sectors, including examples of government funding, nonprofit fundraising, private contracts, and any known grants or philanthropic support.

THE UNLOST EXISTS TO FUND MISSING PERSONS INVESTIGATIONS
AND RECOVERY MISSIONS NATIONWIDE