Google News, which has recently undergone a major facelift, has cut back on so many of its valuable features that I deem it unsuitable for anyone looking for negative news in a due diligence investigation. It now reportedly limits, to 30 days, any articles it returns for a search query. Many researchers valued the Google news feature that went back several years, but regretfully that is now totally in the past.
In its current form, Google News (1) limits the number of returns you receive from a search query, (2) has zero hyperlinks, a departure from its prior format, and (3) appears to value quality over quantity, meaning that you won't see the results that do not have high confidence. Now, when you perform a search, you often get no results at all; this is not acceptable to me.
Do any of your existing data services include CheckForRisk, by Nomino Data ? That's the only resource for negative news that I recommend you use (no, I am not affiliated with them in any way) , if you want total coverage; Check it out.