Junk science is faulty scientific
data used to further a special
agenda.
Junk science is frequently used by, for example,
environmental activists, the "
food police",
government regulators and of course the
media.
Steven J. Milloy has
excellent coverage of Junk science in
society today on his
homepage at http://www.junkscience.com/. I especially recommend you read his paper "100 things you should know about
DDT".