well there isn't much they could do I don't think... cept maybe move the sensor closer to the surface... but it may require a certain depth...
I was told the law in Oregon was 2 signal cycles... I usually wait 1... if it passes my light once... and no traffic is near me... I'm going next chance I get. I'll take the chance of a ticket and plead my case... haven't been pulled over yet for it... though doesn't happen too often