Can anything be done about Poliscan falses?

[jdong]

I've gotten maybe 2 or 3 Poliscan falses over the course of the last year. It's not a lot, and not extremely annoying, but I was caught off guard today by a Poliscan false that lasted at least 3-4 seconds (I saw it still a bit after my JTK in yellow mode but I only have a 5 second JTK timer, so I couldn't tell how long it really lasted). There was a Volvo next to me.

I think it's safe to turn off Poliscan in California, but just out of curiosity, is any more filtering possible, or is the current state of Poliscan false rejection as good as it gets?