Why is surveillance a critical skill for HSI agents?

Surveillance is a critical skill for HSI agents because it enables them to gather evidence and monitor activities related to criminal investigations. This capability is essential in identifying patterns of illegal behavior, tracking suspects, and collecting intelligence that supports ongoing cases. By observing individuals or locations without attracting attention, agents can obtain vital information that is often not available through other means. This firsthand information can be crucial in forming a comprehensive picture of criminal networks, which aids in effective law enforcement operations. Surveillance techniques also assist in corroborating witness statements and other forms of evidence, making them indispensable in building strong cases for prosecution.