Safety concerns raised over popular wakefulness drug (modafinil)
time.com
time.com
This seems like a very poorly written article... and there were no links to the research (or no obvious links).
Also, they didn't actually test for addiction; they tested for a biochemical/neurotransmitter condition which is somewhat correlated with reports of addiction. At least according to the article.
http://scienceblogs.com/corpuscallosum/2009/03/effect_of_mod...