the agent in charge of the fbi's jacksonville office is james casey.o be deactivating quinn's cell phone after each of the calls they made to reid. >> somebody in the scheme was smart enough to take the battery out of the cell phone because we were able to do some technical capabilities and determine that that phone was not only off but had no power to it at certain times. >> meaning you can't trace it? >> meaning you can't trace it. >> while there was no pin pointing an exact address where quinn's calls were originating, technicians were tracing pings when the phone was in use. those are the electronic connections made when a phone hits a particular cell tower, and that gave investigators a general idea where quinn might have been held. fbi agent tony kravit was selected as the lead crisis negotiator for the bureau. >> we're tracking the phone and thinking we've got some leads. >> agents felt they were making progress, but suddenly the phone was also pinging farther away. the kidnappers and quinn might have been on the move. sheriff's detective howard