LUD
Encyclopedia
LUD is a detailed record of local call
Local call
In telephony, the term local call has the following meanings:# Any call using a single switching center; that is, not traveling to another telephone network;# A call made within a local calling area as defined by the local exchange carrier;...

s made and received from a particular phone number. These records are regularly available to police
Police
The police is a personification of the state designated to put in practice the enforced law, protect property and reduce civil disorder in civilian matters. Their powers include the legitimized use of force...

 in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 with a court order
Court order
A court order is an official proclamation by a judge that defines the legal relationships between the parties to a hearing, a trial, an appeal or other court proceedings. Such ruling requires or authorizes the carrying out of certain steps by one or more parties to a case...

, and were traditionally subject to the same restrictions as telephone tapping
Telephone tapping
Telephone tapping is the monitoring of telephone and Internet conversations by a third party, often by covert means. The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on the telephone line...

.

LUDs may be legally used by the police without first obtaining a warrant
Warrant (law)
Most often, the term warrant refers to a specific type of authorization; a writ issued by a competent officer, usually a judge or magistrate, which permits an otherwise illegal act that would violate individual rights and affords the person executing the writ protection from damages if the act is...

, as determined by Smith v. Maryland
Smith v. Maryland
Smith v. Maryland, 442 U.S. 735 , was a case in which the Supreme Court of the United States held that the installation and use of the pen register was not a "search" within the meaning of the Fourth Amendment, and hence no warrant was required....

(1979).

Other terms for call records include CDR (call detail records) or SMDR (station message detail recordings). These terms normally apply to "raw call records" before they have been processed to apply locations and rates.
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