Reddit reviews Science for Sale: The Perils, Rewards, and Delusions of Campus Capitalism

Monsanto, and industry in general, manipulatively smear any study that shows their products lack efficiency or are dangerous to prevent financial loss. Parallel to real science, there is a for- profit, for-hire pseudo-science industry, cynically devoted to producing the critiques and research outcomes contractors expect.

Ultimately, the existence of criticism doesn't necessarily negate any given study.

These are articles on the GMO cancer studies, and its author's response to the attacks:

http://www.gmfreecymru.org/documents/seralini_defends.html

http://truth-out.org/news/item/16565-in-europe-march-against-monsanto-is-latest-rejection-of-the-gmo-giant

>"Professor Gilles-Eric Séralini [...]has been a victim of attacks for revealing that Monsanto products lead to health problems. In 2011, he won a libel case against the French Association for Plant Biotechnology and its president, Marc Fellous. Then, in September of 2012, Séralini demonstrated in a two-year study of rats fed with NK603 maize, that either with or without the use of the herbicide Roundup, a higher frequency of tumors, kidney and liver pathologies were detected. EFSA gave a green light to this maize based on studies over a 90-day period. Monsanto has since waged a heavy PR campaign in an effort to discredit Séralini's findings, although the French Minister of Agriculture, Stéphane Le Foll, has stressed that long term studies on GMOs are necessary and that evaluation and control at the European level should be improved."

http://www.motherjones.com/tom-philpott/2012/09/gmo-corn-rat-tumor

These are more general sources about the undermining of science by profiteers:

http://www.amazon.com/Science-Sale-Rewards-Delusions-Capitalism/dp/0226306259

http://www.ucsusa.org/scientific_integrity/

"Attacks on Science and Scientists

If you're a scientist whose work is perceived as a threat by powerful corporate or political interests, you'd better have a thick skin—and a good lawyer"

A film on Monsanto's attack on scientists finding GMOs dangers:

http://retrofilms.in/index.php?productID=728