A proposed Colorado bill would require law enforcement to obtain a warrant before using a drone, as well as ban drones from using facial recognition or other biometric technology on individuals unspecified in the warrant, according to a blog post by the Tenth Amendment Center.

Introduced by State Senators Linda Newell and Kevin Lundberg, Senate Bill 15-059, the proposed bill also states that law enforcement must destroy any biometric data collected on any individual not included in the warrant within 14 days.

However, law enforcement can hold onto this data if it is later determined to provide ?reasonable suspicion? of evidence of criminal activity or is somehow related to an ongoing investigation.

When a drone is being used in an emergency situation, such as a high risk of a terrorist attack, it can only be executed for a maximum period of 48 hours.

The agency must then prepare a report which details the use, 24 hours after initiating the drone, which will serve as a public record.

The federal government is largely responsible for the expansion of drone surveillance carried out by states and local communities, as the Department of Homeland Security provides large grants to local governments so they are able to acquire such drones.