US taking action against banks involved in "oil for food" program, Halliburton still OK

Fair enough, if there was in fact a scandal the US should go after all guilty parties. I'm not a believer in sanctions because from what I can see they tend to hurt the average person a lot more than the political elite they are supposed to be hurting, but I'd just like to know when we're going to see some action taken against Halliburton for their own business dealings with Iraq (and other countries that US companies are not supposed to be working with) during the years of sanctions. Wasn't that illegal as well? Is the law the law or does it depend on who you are in this administration?