I dont think that any of the great apes should be used in research.
Fortunately Chimps are very rarely tested on. I think that its not a very nice thing to do as chimps are realtively intelligent and because we are similar, I dont really see what you can learn from chimps that you cant learn from ourselves. That said, I do know that they are used in research at Oxford university in things like cognitive research to see how our minds evolved.
However, because of their intelligence and the amount of money it costs to keep them, chimps are very rarely used. They are definately not used in drug research.