I'm somewhat perplexed by all of the talk about GSM interceptors, Faraday bags, etc.
Is it just because a couple of the GB4 left their cell phones at home, and people now assume the SK must have somehow "convinced" them to do so?
The SK obviously knows enough about cell phones to just take the battery/SIM card out to prevent tracking by police. Probably just powering down the phone on many models would prevent the phone from sending any signals that might be tracked. The SK demonstrated some basic understanding of this with Melissa Barthelemy's phone, but most of this I think we all know from watching CSI and Law & Order.
Is it that weird for an escort to leave the phone at home? I strongly suspect that the SK said it would be a quick "car date" (meet me here, I'll pick you up at, etc.). I base this on him meeting Amber down the block in his car. I would think that the girls might have left their cell phones at home because they thought it would be quick, and they didn't want to be disturbed in front of their client, which might impact their tip.
If there's some evidence that supports that the SK demanded or requested that they leave their phones behind, I'll suggest that the EASIEST and most disarming way would be for the SK to say that they've got a pacemaker and the RF from the phone might interfere with it.
See:
http://www.fda.gov/Radiation-Emitti...nessandEntertainment/CellPhones/ucm116311.htm
There are only a few motives for the SK to not want the girls to bring along a cell that I can think of:
1) They don't want to be traced after the crime.
2) They don't want to be traced prior to the crime (i.e., police match GPS coordinates and traffic cameras to ID the car model/license plate)
3) They don't want her to call police if they somehow escape.
4) They don't want to have access to their cell phones after the crime because they know that they have a propensity for using it to make threatening calls to the victims families, friends, checking voicemails, etc. - thus increasing their risk of getting caught
Someone like Carman Monaco Jr. might fall into the fourth category (see my thread on Carman) if he is the SK. But again, I doubt that the whole "leave behind your cell phone" thing played into setting up the date - it would just be TOO creepy and alarming unless there was a medical reason to do so.
The other thing that I'm suggesting we consider is that the SK never really gave a darn whether they had their phone or not. The SK maybe was not as sophisticated and premeditated as everyone seems to believe he is. Maybe the SK is actually not that technically savvy at all - all they really know is to power down the phone when not in use, call from locations that are really busy and don't leave it on for more than 3 minutes. All of this you might learn either from CSI or if you were prosecuted for stalking and had been investigated for 6 years for making lewd and menacing phone calls - like Carman Monaco Jr.