Though Google’s official motto is  “Do no evil” , they certainly do hire evil employees.  Internet marketer sues Google employee .

When I was using Adsense on my websites , I always felt that the code was used to track the websites  I owned , how I marketed them, how I gathered content for my website and to collect a lot of other information.  It may not be their official policy yet, but they definitely do not have good systems in place to prevent malpractices.