Erroneous reports are not that easy to find. Each combat can be easily analysed, but a generic engine is really harder. Nevertheless we have some good ideas (that has been listed for the majority of them on most forums). As a side note we don't like exceptions treatment because the current WWS overall engine is a huge load yet, and will be increased in some ways at the 2.4. But don't worry, it is planned, we can't keep cheated reports longer.
90% of erroneous reports are not cheated. They are generally caused by combat log snippets or bad merging. These show up quickly when you band a known good kill and only accept kills in that range. I can't do moroes in WWS Scoreboard, and I can't pull the damage done to just moroes himself without a second pull, which I won't do. You however can.
If you filter reports on the following 2 criteria
1. Damage to the boss within 20% of a known baseline
2. Time of the fight > 15 seconds.
You will eliminate 99% of the junk. If 2.4 combat logs record entering combat (Or you trap entering combat through the WWS Addon) you should be able to eliminate almost everything by verifying that an entering combat was seen before (Or within a few seconds of) the boss being engaged. That would eliminate almost everything except for the few groups of idiots that think that editing logs and uploading them to WWS to show how great they are, actually makes them great.
For duplicates, you just check if a player has been seen already for that boss for that day and time (Converted to UTC) and allowing +- a couple of hours for bad clocks. Since you have that for everything (I don't because of anonymous reports), it should be a lot easier when building the top reports for a boss. That would take care of almost every case where multiple people in the same guild upload a report. The WWS Addon should also be able to capture guild name and server, so that should eliminate people that can't set their guild name to the same thing as their guildmates.
Feel free to send me an e-mail if you want more details. I've offered them to Lossendil as well. I know your busy and this is at the bottom of your list right now.
In other news, the first 6k sustained boss DPS report occured yesterday. 6824 sustained for the encounter. (Damage/Time). WWS Scoreboard