My main site has an active forum section, which I've never put ads on. This has never been a problem, until recently when I got a policy violation alert about #*$!ography. The example link given was a forum post from five years ago that had text URLs which led to adult images. So it would seem there is a bot checking deeply through a site, in sections that have never had ad code, looking for violations, and will raise a flag even for URLs in text.
In response I wrote a script go through and score old posts that may be objectionable, and delete them. This, I hoped, would resolve the issue. And yet...
I've gotten another alert, for adult content, in another area of the site with user-submitted content. The cited URL leads to content that discusses feeling "sexy", and this poses a dilemma, because unlike the issue on the forum, this content is very PG/tame. It leads me to question where the line is being drawn. Also, this content has been up for six years without issue. Also also, it has never included any ad code, because I'm super-cautious and have my own list of stop words that, if present, switches ad network code for in-house ads on any page that could be questionable.
So it now appears to be the case that if you run AdSense on a domain, that domain must not contain any violation anywhere, even in sections that have never displayed ads. A forum user can ruin your day regardless of no ads appearing alongside their post. My policy of keeping ads off any page that could be questionable, a strategy which I considered "playing it safe" in the past, is no longer sufficient. Now I'm faced with the prospect of going through a ton of old content and trying to make a new, more conservative judgement call on whether it should stay, go, or be edited. But to what standard? This is very frustrating, to say the least.