Phone LUDs are records of calls made by a particular telephone. Local Usage Details refers to all local calls going in and coming out from a specific phone.
Police can use this information to see if a suspect called someone, and how long they talked. These records can be obtained with a court order; police do not need a warrant. The records don't indicate anything about the content of the call. Transcripts and recordings of calls require police to tap the phone, which requires more evidence than a phone log.
Phone logs are known as LUDs, Call Detail Records, and Station Message Detail Recording.
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