Basically, any politician with knowledge access should be presumptively found guilty of insider trading, when they personally trade. If that's the metric, Congress would drop trading while in office, in a heartbeat.
If they own stock, options, or any associated vehicle, they should have it in a (really) blind trust. If they're unable to comply, they should be arrested on their first trade, in office.
Gee, I hope that isn't too harsh! (sarcasm, sarcasm, sarcasm.)