Updates to questions asked:
1. Professionals search hard drive?
No one outside of the police searched the hard drive. Not known if this is considered professionally or not.
2. at any time in the last 18 months did Brian have a computer replaced, repaired, stolen or an old hard drive trashed?
No
3. at the time Brian planned the stay in Carrollton, did he expect to spend the time at the house alone?
Yes, Brian would be the only one in the house. It remains empty with the exception of family events or if family from out of town visit.
4. was Brian getting prescriptions by mail and did he get a three months supply that might not be accounted for?
He did not receive prescriptions through the mail.
As far as the e-mails go. He had two accounts:yahoo and g-mail. His niece knew the answers to his security questions and reset them. Nothing of interest was found on the hard drive.
In answer to my question: She thinks Brian is in NCMA. I could not find him.
This one is perplexing to say the least.
Medical emergency - I doubt that happened as he would not have gone far. Even if he went out for a drive at 7 am, I don't think he would have left Carrollton. A medical emergency is just that and he would have been near his car and someone would have found a body.
Victim of crime - If he went out for a ride at 2 am, it was said he would have been no more than 5 mins from home. According to crime statistics, Georgia is safer than the national average and Carrollton is safer than the state as a whole. I don't see anything happening at 2 am like a carjacking. Plus the car was eventually found in the exact same condition, except someone switched plates.
Accident - I don't think Carrollton has any road hazards like gorges or lakes that he might have driven off of or into. I assume that possibility was checked out.
Voluntary departure - always a possibility but he needed expensive medication. If the computer is in fact clean, then he did not use it to hook up with anyone. I think I read he was a land surveyor. Was he on the road alot? Where were most of his jobs, Atlanta area? Are there many internet cafes in or around Atlanta?