Cameras In The Home: 'Til DVR Do Us Part?

The other day my neighbor asked me to help him get a security system rigged-up, 'cause he knows I dabble a bit. I told him to set down on paper what it is exactly that he wants it to do. Frankly, what he gave me shocked me, so I told him I wanted to look into the legalities and what not. Here, in his own words, is what he gave me:

“[My wife] and I are constantly fighting and accusing the other of lying, or more like ‘rewriting history’. I remember her clearly telling me one thing, but later she will claim she said something entirely different (and vice versa – she says I say ‘that’s not what I said’ more often than she does). We have succumbed to using our cell phones to record heated conversations, but that usually isn’t thought of until most of the way through a fight. I got to thinking if we had a system in our house that we could ‘go back and listen’, it could solve a lot of disputes around here. [My wife] has agreed to this and any such system will not be hidden nor secret. We have a pretty small house, so I’m thinking if we could have one camera upstairs and one downstairs, it should be able to capture most of what goes on. What the camera sees is not as important as what it hears. Ideally, it would record all the time, keeping about a week’s worth of footage at a time (I assume it would then overwrite as it goes?). “

While back I went to a seminar where the speaker’s motto was “act as if the camera is always rolling”… as a matter of course, anyone would be at their Sunday best when 'on the record', wouldn't they? Anybody ever heard of somethin like this? Any advice at all much appreciated...

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