The FBI has developed new technology that enables it to listen to conversations in homes from vans parked in the street outside the homes. While listening to conversations in one neighborhood, the FBI uncovers a meth lab. Agents move in and arrest those in the home without a warrant. Under the Kyllo case:

Question

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The FBI is required to have a warrant in order to listen to conversations, regardless of whether it was done from outside the private property of the individuals involved. The Kyllo case established that using technology to gather information that is otherwise not obtainable without a warrant constitutes a search under the Fourth Amendment. Therefore, a warrant is required in order to conduct such a search, including listening to conversations.

The FBI Has Developed New Technology That Enables It to Listen