Hall had asked the F.B.I. for help searching the jail. The F.B.I. enlisted Customs and Border Protection, which uses advanced electromagnetic scanners to search suspect vehicles. At the jail, technicians from the two agencies wired a scanner to a signal amplifier, allowing them to peer through cinder block, metal, and other materials without causing damage. The device was mounted on a trolley and rolled by every wall in the jail, looking for the “hot spots” where Friedmann had embedded weapons. By March of 2020, they’d found more than twenty. Crime-scene investigators bored holes and pulled out a succession of neat plastic packages containing razors, saw blades, handcuff keys, and security bits. The prosecutors called these “escape kits.”
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