Too has two o's in it. Don't feel bad about messing that up, I made the same error and edited my post when I realized it.
And it is highly amusing to me that you ignored all my other points, and simply made a demand that I figure out how to do it, when I already stated that I am "studying" to be a doctor, thus I would be unaware as to the exact methods to prevent such an entry.
My medical teacher, however, is not. He used to work for the FDA researching methods to prevent viral infiltration into the cells, thus stopping the cold from infecting the host (aka us), and stopping it from bieng able to spread in general. At a lecture he gave us, we were informed that a member of the team he was working with made a critical break through in this field. His superiors were notified, and a week later the entire project was canceled, and all of the staff, including my professor, fired for "embezzeling" the money they were given.
Interestingly enough, if this were true, he would have faced criminal charges and been indicted, most likely resulting in criminal persecution. Yet he was simply fired, and the entire team's research confinscated and classified. Strange isn't it. Cynical? I think more on the lines of realistic and informed.
And once again, some people are far too naive for thigns they know nothing about or understand.