While the screw up in erasing NC's phone was pitifully stupid, and while it ultimately served as a huge gift to the defense, because they could use that screwup to make a 2-prong attack: incompetence (which was accurate) and conspiracy (LOL), here's why it wasn't quite as dire as some thought:
- All phone calls are logged at the provider's servers. Date, time, length of call, whether call was answered or went to VM. There's other data in there as well, I just didn't list it all out.
- All activity in the form of txt messages sent or received through the provider is also logged. Not the content of the txt msg, but the basics: date, time, and phone number of the sender or receiver of the msg.
- All phone activity that uses the provider's network is captured via pings off one or more towers when a phone is on and transmitting, allowing the cell provider to know where the phone is in general, based on which tower was transmitting. This is in addition to logs which capture phone call and text/data activity from the phone.
Here's what was learned about Nancy's phone activity from Friday 7/11/08 at night and onward (all in various testimony at trial):
- The last phone call NC received the night of 7/11/08 occurred around 10:30pm
- Nancy never used her own cell phone again to make a call or send a txt. Not Fri night 7/11 after 10:30pm and not anytime on Sat 7/12.
- The morning of Sat 7/12/08 NC's phone did receive calls (which all went to VM) and at least one text. The identity of each of those people is known because the phone numbers were logged by the cell provider and the police had a copy of the logs.
- No one called or sent a txt to Nancy about some secret rendezvous (like from some boyfriend). There was nothing on the provider log. If there had been, the defense certainly would have highlighted that line item and made sure the jury knew about it.
- Nancy did not have her phone with her when she supposedly went running. No one could have gotten ahold of her.
- Nancy was not an active Facebook user. She had an account and had 2 or 3 people on her friends list. There was nothing contained in her Facebook account that provided any information. All Facebook activity lives on FB servers.
So her movements while she had her phone was determined. The calls received and sent from her phone were logged. Ditto txt messages. And there was zero activity from Nancy's phone outward (i.e. making a call or sending a txt) after 10:30pm Fri night.