If you have some time, read "Warrantless location Tracking" 83 N.Y.U.L. Rev. 1324 http://www.law.nyu.edu/ecm_dlv2/groups/public/@nyu_law_website__journals__law_

If you have some time, read "Warrantless location Tracking" 83 N.Y.U.L. Rev. 1324 http://www.law.nyu.edu/ecm_dlv2/groups/public/@nyu_law_website__journals__law_review/documents/web_copytext/ecm_pro_059784.pdf http://www.law.nyu.edu/ecm_dlv2/groups/public/@nyu_law_websi... A common step in police investigations today is to secure a court order tracking the movements of a suspect or anyone else whose location the police believe useful. The flip side of this powerful tool, though, is how revealing and intrusive it is. Few people would be comfortable being followed by a police officer all day, even if they did nothing illegal or even interesting. Justice Brandeis once invoked the "right to be let alone," and undetectable location tracking pressures the alone part: No one is "let alone" if the police may, without notice or probable cause, find out everywhere they go for a day or a month. It's a good, if disturbing, read.