What technique is employed to pass contraband through a checkpoint as part of a larger investigation?

The technique referred to in the context of passing contraband through a checkpoint as part of a larger investigation is known as Controlled Delivery. This method involves the intentional shipment of contraband under the supervision of law enforcement agencies, allowing for the observation and capture of those involved in the smuggling operation.

Controlled deliveries are strategic in nature; they enable investigators to gather intelligence on trafficking networks and apprehend individuals involved in illegal activities at a pivotal moment. By utilizing this technique, law enforcement can collect evidence and potentially disrupt further criminal activities tied to the contraband.

Other options may relate to investigative techniques but do not specifically focus on the action of moving contraband through checkpoints for the purpose of gathering intelligence or evidence in an ongoing investigation. For example, while an undercover operation is critical for infiltrating criminal groups, it does not specifically address the act of passing contraband at a checkpoint. Similarly, surveillance is useful for monitoring suspects but does not entail the controlled movement of contraband itself.