Wouldn't I be pretty stupid if I had a problem with these things, yet still uploaded these documents in clear text to Google's servers where absolutely nothing stopped Google from doing these things? Especially when they tell me point blank that they do indeed sift through the documents (for ad targeting)?
* Google scans email, not other documents in Drive: http://support.google.com/a/bin/answer.py?hl=en&answer=60762
* Just as the NSA claims that collecting data doesn't count until a person reads it, Google affirms that humans do not read user data without permission.
* Documents are are encrypted in transit, not uploaded in clear text.
Google Drive is very much like a safe deposit box in a bank, in terms of user expectation of privacy, and vendor promises.
If my secretary holds my briefcase, is the government allowed to seize it without any warrant or judicial approval?
Email is slightly more complicated, due to automated ads scanning.
if your secretary agrees to give it to them , of course they can.
In a world where important documents are increasingly electronic, and electronic stuff is increasingly routinely backed up, transmitted through, or just stored on remote servers, people's personal papers will be increasingly in the possession of others.
I won't argue that it's impossible to read the Constitution so that it becomes a set of meaningless restrictions on outdated technologies--legal text is never deterministic and always subject to multiple interpretations--but it's certainly not unreasonable for somebody to have "read the document very carefully" and found it more robust and relevant than you do.