What happens when a small unmanned aerial system (sUAS)—or drone—enters sensitive civilian air space? When such aircraft threaten public safety, law enforcement agencies face a significant challenge. Most technologies developed to take out intentionally rouge or negligent aircraft (called counter unmanned aerial systems, or CUAS) are based on radio frequency detection and interdiction. Many law enforcement units appear to be counting on such RF countermeasures. But this raises significant concerns.

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