Too bad nobody makes a hacker zapper!
We actually have one and it does work quite effectively. If something makes it past the zapper we report it to their data base. As Dave and Scott said, we do have one that makes it through a few times a week.
Also, if anyone reports a problem, all of us get an email from the site. I have my phone and tablet set to a distinctive sound for any email from the site. That way I can quickly look at it.