I do know that NamUs scans through for certain criteria, and puts the MP on a list for that UID if the criteria are met. The case manager, LE or ME person then goes over the list and marks them off if they can rule them out. Those rule-outs are then published on the NamUs publicly viewable case file. The ones that remain unmarked (and still possible) are invisible to the general public.
What I do not know is what the criteria are. I've pointed out before where MP's ended up on the list even though their Date of Last Contact was years after the UID died.
There is an automatic check for DNA in CODIS, but AFAIK, there is no such automated DNA check in NamUs. But I am pretty sure there is an automated dental chart comparison feature in NamUs. For the MP, the dental data is in the system in many cases. It just isn't visible to the public as the UID dental data is.
In theory, NamUs is a fantastic idea. In practice, there are too many people entering data who are too cavalier about being complete and correct. That's the problem with a decentralized do-it-yourself system. Some users (e.g., VanNorman, Hal Brown, Chris Edwards, et. al.) are very meticulous. Others are satisfied with just creating a casefile with no detail, or don't double-check their data entry, and you end up with female UID's that are listed at 8 1/2 feet tall.
Obviously, NamUs is not kicking out matches for that reason.
Pardon me if I am
ther_beatingA_Dead, but ...
We had previously discussed a case where a woman about 19 years old with a postmortem interval of three days was found in 1993. NamUs proposed a PM to a woman (Evelyn Hartley) who went missing in 1953 when she was 15 years old. If you ignore the postmortem interval, no it's not impossible because her remains could have been there for 40 years. But all things considered (including PM interval), even with a generous margin for error, this possible match would be virtually impossible because the UID wasn't even born until approximately 20 years after the MP was last seen. If you are going to allow for such a wide margin for error as to include Evelyn Hartley, then why not just propose every 5'7 to 5'9 Caucasian female in the database on the grounds that there might be an error? (For that matter, maybe it does.)
I am very big on using technology, but you can't replace human judgement to decide whether the data entered is reasonable, or whether key data might have been omitted. I would like to see those MP dental charts, and decide for myself whether to consider the possibility of data entry error.
But I agree with you that there shouldn't be computers making that decision for us, and then saying "don't bother looking because it's not a match". And LE should not be using NamUs as an excuse not to exercise their human judgement.