A Pathologist is suing a drug manufacturer, and the casinos that he lost his 14 million dollar Fortune to, because the drug that he was given causes compulsive gambling. I think that not only the drug manufacturer, but the casinos could loose that lawsuit, despite the objections about "where is the justice in this" that I've heard.
The lawsuit has nothing to do with justice, and everything to do with philosophy. In the dominant philosophy in the US right now (Kantian Altruism) it is accepted that "we are our brothers keeper" which means that the casinos have the responsibility to tell someone who is hurting himself by loosing too much "you've had enough now brother, time to stop". It doesn't matter that this introduces a whole new mess of problems for the gambling industry. Just like the can o' worms that bars now face (and that McDonald's et al narrowly dodged by adding 'healthy' items to their menus) in having to be "brother's keeper", the casinos have a responsibility to do likewise.
The only way this can be corrected is to change the dominant philosophy in the world today; a daunting task.
As a Capitalist/Objectivist, I'm not going to bother trying to defend the argument that the casinos should be liable; I'm just stating for the record, that based on Altruist values and reasoning, they are.