I have to believe it'll be Deb, since she's already getting close to Dexter's past. I think she'll decide to go back and investigate the last person on her list (Moser) and find that the records are no longer available and realize that Dexter had them last. She'll probably find the half-shredded picture in Dexter's desk as well. I hope it goes this way, otherwise Deb's whole investigation would've been a totally useless storyline (much like last year with Quinn's Internal Affairs investigation).

DNA checkpoints? What the hell is that?

Perhaps they ripped the idea from a similar event last year in daytona beach (looking for a serial killer no less)
http://www.sott.net/articles/show/14...day-along-Nova

I was thinking that trinity's son takes out the car and goes through one of the checkpoints and gets swabbed and they get a hit on the dna samples they have from the ash or blood ( whatever they have DNA from )

If they pinned 30+ years of murder on a 19 year old, that would be lazy writing!

(I know what you mean though).

The son couldn't get picked up in the DNA sweep because they were only testing older tall white males.

... leaves to clean coffee from keyboard.

Not likely to happen here but that is sort of what they did to confirm BTK's true identity.

I'm imagining X-Files season nine...

Stop right there!

Killing an innocent man really seems to have affected him much less than I thought it would. I expected him to be having an emotional breakdown in the next episode, but he acts like it never happened. Makes some sense, though, since he doesn't really have emotions in the normal sense.

Well, as a Cuban from Miami, I'm always amused at Hollywood's take on Miami's Cuban community. They tend to mistake us for Mexicans.

There was that episode where Dexter saved the smuggled immigrants from a trailer where a "coyote" had locked them up. This phenomenon is Southwestern. I don't believe they're called coyotes in Miami and generally Cuban immigrants aren't illegal, they're granted asylum upon reaching American soil and of course, they come in boats or rafts, not trucks.

Recently Deb walked up to a Cuban food stand and ordered some tacos. I laughed my ass off.

More recently, Batista got all excited about sharing some Cuervo tequila with Laguerta. While I'm sure there are plenty of Cubans who drink tequila... really, if they wanted to be authentic, Cubans are nuts over rum. Specifically Bacardi.

There's also the sight of rich white people with Cuban maids. Again, this is a Los Angeles phenomenon where the rich white TV people have Mexican maids. In Miami, the rich person is actually more than likely to be Cuban or South American than white. Many rich Venezuelans have resettled in Miami recently to get away from Fidel Jr. The people in positions of power in Miami tend to be Cuban or other Hispanic, but you don't really see that a lot in TV and film as Hollywood writers have the L.A./Mexican model in their heads, and place them as the maids or scared illegals.

I could see a really poignant season of the aftermath of Dexter's death and all the supporting characters trying to put the pieces together. Imagine Deb finally figuring out what her brother was, and Rita/Batista/etc. turning on her because they won't believe it. There is all kinds of dramatic material here, but I highly doubt they'd go that way. Dexter's presence and inner world are a huge part of the show and as good and successful as the show is, I'm not yet sold on the idea that next season is the final one... unless I just haven't heard the news yet.