“The technique, known as a ‘Tower Dump,’ allows law enforcement to request all call, text and data transmissions from any specific time period from a cell tower’s provider. Search warrants obtained by WLTX News uncovered Richland County Sheriffs use of the technique during several cases including a 2011 vehicle break-in outside a sheriff’s home. Under South Carolina evidence retention laws, if a suspect is convicted of a crime in which a Tower Dump was used, police can hold onto all information gathered for up to seven years, including the data of all innocent cell users. According to the Richland County Sheriff’s Department, innocent cell users have nothing to fear.”
http://www.infowars.com/south-carolina-police-grab-innocent-cell-users-data-through-tower-dump/