Why Isn't There an Anti-Date Rape Drug?

The kings of the drug industry come up with a new pill every other week. They even have drugs that help sexual problems, but what has been bugging me lately is why has no one made an effort to do research on drugs that can be taken that would make it hard for date rape drugs to be absorbed into the body. I saw a statistic that says 1 out of 6 women has been sexually assaulted or raped in the U.S. Twenty percent of a population that is over 50% of the entire country can be subjected to this and not one company has run it by their R&D. Given the numbers, they could make a tidy profit, so why not finally make money over something that will help save people from experiecing that kind of hell?