Tipp, I bet you would be a kick ass journalist or writer though, but you missed this tidbit. Basically they gather all the information at a location and weed out what they want.
Here was the speculation of fact;
http://arstechnica.com/tech-policy/2...public-places/
"The Federal Bureau of Investigation is taking the position that court warrants are not required when deploying cell-site simulators in public places. Nicknamed "stingrays," the devices are decoy cell towers that capture locations and identities of mobile phone users and can intercept calls and texts."