So the dumb people who get caught looking for that information get screened out, but the smart dangerous people who happen to learn how to avoid having problems with a "lie so-called-detector" test will pass with flying colors? How does that help?
You can't stop every problem, but you can minimize it as much as possible.
The only way you can secure against this is to control who you hire, and control as much as possible what they can do. To that end, sharing of this data is perfectly reasonable, as long as safeguards are in place for who uses the data, which is almost always there from my experience.