''Tests complete'' doesn't necessarily mean someone's been ruled out. There are several types of DNA (nuclear, mitochondrial, and then Y-string for guys) and they can't be compared against one another. You used to be able to see which one was entered for the UP/missing person, but the changes made to NamUs in November 2013 restrict that information to LE.
Let's say a missing person is entered into NamUs and mtDNA was submitted. Their unidentified body was also entered into NamUs recently, and LE submitted nDNA for them. Both profiles will say ''Samples submitted - tests complete'', but NamUs will not recognize the match because you cannot compare nDNA and mtDNA. They're the genetic equivalent of a tricycle and a Mack Truck.
Like I said, you used to be able to see what type of DNA was there, but now you can't. The reasoning was that LE was getting 'inundated' with tips and restricting that information would reduce the volume of incorrect leads. Which doesn't really make sense, because what you've done is probably just gotten yourself more leads that could've been avoided had the tipster known what kind of DNA was available.
What I'm saying is, don't rely on the DNA section in NamUs. It's useless and misleading in its current form. We don't know what kind of DNA was entered for them, so you should submit the potential match anyway just to be sure.
You can rely on dentals, though. If it says ''Available and entered'' under the 'Dental' section for both the UP and missing person, it's a rule-out.