It's obvious that photo radar van operators and police are using Waze. I have driven by a PR van, reported it, and on my way back the report will be gone but the PR van will still be there (someone reported it as "not there"). There should be a "not there" safeguard in place, where depending on your rank on the scoreboard, so many reports of not being there need to be filed before it gets removed from the map, and a "Thanks!" report cancels out a "not there" report.

For example: I am a Knight, so either a Knight/King can cancel my report, or 4 baby wazers can cancel it.

That way, the PR operator shouldn't be able to cancel the report the moment after he gets pinned on the map.