Icebreaker Part 2 – Confidential Homeland Security Asset Forfeiture and Search and Seizure Handbooks. Unicorn Riot obtained confidential Department of Homeland Security manuals showing how the Department of Homeland Security’s largest investigative arm, Homeland Security Investigations, advised its agents to conduct their operations. Part 2 of the Icebreaker series covers the HSI “Search and Seizure” and “Asset Forfeiture” handbooks.