Can I ask a couple questions...I've tried to read all 100 pages, but my head is spinning on a couple points...
Is it definitive now that the license is in the purse, rather than the dashboard, or is this still an open question?
Is it definitive that they were or were not shot in the trunk, or was that just speculated to be the case because it might muffle the sound? I read different theories, but it would seem to be pretty elementary based on blood/matter spatter to determine if they were shot in the trunk.
This is a horrible story. I have a couple thoughts.
I tend to agree with those who think the DNA is a false lead. Especially with how long it took to turn up, and the manner in which it was found. I think it's very possible it could have been from an earlier encounter. Teenagers are very secretive about that kind of stuff, and it's quite possible that not a lot of people knew. There's a myriad of possibilities of why someone who "left" the DNA might not have come out and reported the unrelated consensual nature of it, whether they were in another relationship, were of an inappropriate age, etc. To me, if it's just deposited and left there, especially post mortem, that's something that would be most likely pretty apparent on an early inspection when it dries. I picture a scenario where the victim "cleans up" from an earlier unrelated encounter...but not clean enough that residue isn't picked up in the lab.
I also think the entire party/lost/not really lost thing is pretty nebulous, and might not even have a definitive answer. When I was that age (about ten years before the murders), having "plans" just doesn't mean what it does as an adult. In addition, in the days before ubiquitous cell phones and texting, this kind of stuff happened all the time with teenagers...saying you're going to be somewhere really meant more like you "might" be there.
The timing of having so little time before curfew to go to the party (or anywhere all that specific) implies to me that the main thing is the girls just wanted to get together...they might have gotten in the car, got in a conversation, and just started driving around. They might have had a destination in mind, or not really. That was something that was actually quite common for me (a male) at that age...you start driving, you get in a conversation, you're ambivalent about the party, decide to maybe check out another place where you heard about a party, maybe not...you're really just hanging out with your friends listening to music...and being a teenager, driving around in a car is one of the places you can do that. Back in that day before texting and being in 24/7 contact with all your friends, just getting together was a big deal, and often times more important than any given destination or activity.
I guess I'm just hesitant to put an overly huge amount of emphasis on their plans and the timeline...given they barely had time to go to a party, I think there's a good chance they just wanted to get together, maybe talk about something or someone, and just drove around. That would explain the gas used. They might have circled around and back the the same route multiple times. Maybe they eventually got lost, maybe they weren't lost, but had to call and give their mom and excuse. If you're going to get out and call your mom to tell them you're lost (as an excuse), and there are people standing there concerned, you pretty much would ask them for directions just to fit the story. You're not likely to tell them "Oh we're not really lost, we're just lying to our mom".
Just a long way of saying, I'm not sure they had to be lost OR had to be in Ozark for intentional clandestine purposes. Could just be teenage cruising.
As for the murder...I can't help but think it was something that got out of hand...that the murderer never intended to murder them whenever it started. I still think, driver's license or not, that a police impersonation is the easiest explanation of how they got stopped. Maybe he was a guy with a police fixation, who was rejected from the career. It's possible that he got his jollies by impersonating a cop and pulling over pretty women. Just that feeling of power and fear over a woman might have been enough for a guy who felt powerless with women in real life.
Somehow, I feel like it escalated...they realized he was a fake cop, maybe threatened to call the police, took off and ran. Not sure how it happened, but I think they ended up dead because the perpetrator got scared and didn't know what else to do. I think he was used to just harassing women and walking away, and it broke bad this time. I think it's possible that they were alive for awhile, while he tried to figure out another way out.
While I think he did get a sexual high from harassing women drivers in his normal game, I don't think he left his DNA or murdering them was directly a sexual act like that. I think he left the car where it did so they would be discovered because he felt bad about what happened and wanted them to be found. I don't think he considers himself a murderer who would hide bodies, and he doesn't think what happened was his fault. I think it's possible he hasn't killed again.
For those of you familiar with the area, how out of the way is it from major highways? I tend to think that he's not local, and either came into the area from out of town to play his little fake cop game, or was possibly just passing through, stopped for gas, and saw an opportunity to play. I think he could be from anywhere in the country.
I would be looking hard at anyone nationwide who might have been caught impersonating a cop, especially doing so and asking inappropriate questions of women.