I'm not sure the window of opportunity for phone records. Someone posted some information on that some time ago. There are 2 different ways to do it I believe, they could subpoena individual phone records, not sure how long records with location data etc are kept by a carrier. Of course the subpoena has to be submitted by LE not a PI. We were told they asked for BC's records and allowed her to go online and print them herself. But that doesn't tell the whole story, ie location data. We know from PK on BS that they could see BC turned her phone off for a couple of hours. I am not sure but it doesn't seem like they could see that in her actual records, maybe they saw it from tower dumps, you know her phone is pinging a tower or another regularly then nothing. That is the other option and with that they could look at all phones in the same proximity as his phone or home. I seem to remember those records are kept anywhere from 12 to 18 months depending on the carrier. So maybe they knew her location.