CALEA forced a redesign of the foundational, physical layer of the internet. Thankfully, encryption at the protocol layer - in the programs we use - partially counters this deliberately introduced brittleness in the security of all our communications.
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CALEA can be used to intercept your communications, but mostly what an attacker gets is "metadata" ("so-and-so sent a message of X bytes to such and such") because the data is scrambled and they can't unscramble it, because cryptography actually *works*, unlike back doors.
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