Comment Lets try this.... (Score 4, Insightful) 790
With legal (or cracked) access to anyone's email account (sex offender or not) lets see how easy it is to plant evidence.
1. Access account, add a folder or label (preferably hidden buy being buried in default sort order or under another folder).
2. Set filter with obscure rule to automatically route certain emails to said folder.
3. Send "illicit" or "evidentiary" messages that match said filter. These can be sent from self or whatever generated entity seems appropriate.
4. Access account again from various public IP addresses (or from target's own wifi). Read already read email, plus messages in target folder.
5. Remove filter. Have Google 'find' the evidence. Arrest wrongdoer.
This is not that far fetched. The chain of evidence doe not prove that the target is guilty, but can be made to look enough like it to convince a judge or jury. From the vantage of Google or a jury, it looks as though the subject sent or had sent, expected, and read the messages.
Just about anyone here could do this with the creds to an account - which in most situations are not terribly hard to garner.
Before you say you would notice the folder in your account, think of this. I have over 100 folders in my email account, some rarely opened, and never all visible on the screen. I wouldn't have noticed - but I may have enough knowledge to fight - a little anyway. How about a novice, when a folder named 'Archived Messages' appears. Would he/she even think twice?
I did not RTFA, but I know google uses their image search algos for blocking known child porn sites. It is not a hard step to run that against email messages. How about when the NSA/CIA/FBI tells google (via a NSL) scan all messages for x terms. How about when said terms are sent to and from hacked accounts as a matter of course?
It is important to realize that absolutely no communication that is unencrypted is private, but how about whe forged open communications can make you a criminal?
