I agree with MDSandB, IF you know the IP of the person clicking on your ads.
If not, but you notice a spike in your CTR approaching or exceeding 100%, email the google and tell them what you suspect. Don't let it go, like I did, and lose your account. It's really a pain in the ass to get a new one.
Finding a script that works for something like this might not be impossible but I wouldn't rely on it. The google changes thier shit way too often so you'd have to constantly be looking for updates.