Because her doing State department email on her phone or laptop ain't nothing new in government. They all do it and have done it. Yes it was against policy.....so what. She aint SOS anymore. Why waste money investigating, it ain't like this issue will ever see a court room. To think otherwise is folly.
It's the same with fast n furious and Benghazi. When everyone from the President on down knows about something, nobody ever goes to jail except a couple peons. Kinda like Watergate and Iran/Contra.
But i digress. ....this us about a private email account vs a govt provided email account. Either way govt people know what was sent and received.
Personally I wouldn't give a rats ass if they spent 10 billion doing forensics on that thing. It doesn't necessarily even have to go to a courtroom. After a couple of months of letting her sweat while the forensics are going on, you send in a couple of FBI interrogators and ask her if she want's to disclose anything. She just might