When Rebecca was being escorted to her cell her facial expression showed that she saw Red John right before he put the poison on her hand. She was giving him that crazy-eyed adoring smile. Wouldn't the guards who were walking with her have recognized him if he were already a member of the CBI?

Fyi: I just read an interview with Bruno Heller by Entertainment Weekly. He said that RJ is definitely one of the 7 suspects on the list. He is not tricking us. He said there will be no more tricks, and i understood him to say that we will find out the truth next season. He also said, definitively, RJ is NOT Patrick Jane. Thank goodness. That would be heartbreaking and devastating.

☺ His job gives him access to the CBI and allows his to revisit the crime scene 
☺ From the season 2 finale, when Red John's voice was revealed (and similarly displayed in the season 4 finale), his voice appears to be the closest match out of the suspects list
☺ He's been featured on the show since the first episode; Bruno Heller said Red John's name wouldn't be revealed till season 7 (he said "in two or so" seasons during season 5's run) and it would be a "big disappointment"---Brett been there since the start so it'd be a disappointment if he's RJ since it'd be like we overlooked him all this time
☺ He's probably over 30, he has short straight hair, he's white, and he's just under 6 ft (just by looking), all traits of RJ as confirmed by the clues we have thus far
☺ Even though Jane disrespects him, he lets it slide; in the season 5 finale start, he let Jane boss him around, almost like he knew what was going on (like it was planned)
☺ Just random, but the word "red" is incorporated in his name if you move the letters around

I made a post earlier, but have given more insight and reasoning into my theory's.

Red John is not on the current list of seven. Why? Remember when PJ sticks the toothpick in the wall and Kirklands minions come in and take photos of everything in the room. When PJ comes back he notices that the toothpick fell and even smiles a bit. The list of seven is a decoy to lead RJ astray. Now we know that Kirkland is connected to or works with RJ in some way. Kirkland sends his boys in to find the information, his boys come back and say that they will view the photos and de code the information that they got. Kirkland says no, and that HE will only view the photos. Kirkland then relays that information to RJ. PJ knew that someone would break into the room, so he put up fake information.

Now, obviously PJ and Lisbon love each other and I don't think PJ would ever tell Lisbon who his real suspects are because he would never want to endanger the person he loves. Also, another reason why PJ would never tell lisbon his real suspect or list of true suspects is very simple. PJ wants to kill RJ and make him suffer while lisbon on the other hand wants RJ tried in court, PJ responds by saying "not if I'm still breathing". So PJ would never risk telling Lisbon who he thinks RJ really is because she might get in the way of his vengeance.

In this years season finale Jane receives a CD from a RJ co worker who obviously knows tons about RJ and says that "I have been with RJ for a very long time". The woman rides in the back seat of a cop car with only 1 policeman who obviously can't keep an eye on her because he is driving, so she kills herself (to supposedly keep RJ's identity safe). Why would Jane let a person who has bountiful amount of information on RJ and had been with him for a long time just be able to kill herself? Because he doesn't need anything from her... Because he already knows who RJ is. I don't know who it is but I'm 99% sure RJ is not on the current list of seven. I believe the video with lorelei was MADE by PJ to confuse and protect lisbon. PJ hyponotised the women that worked with RJ and made her kill herself because PJ somehow found out she worked with RJ in the past so he hates her and made her kill herself

Now, to address those of you who say HELLER CONFIRMED RJ IS ON THE LIST, yes heller did confirm RJ is on the list, but he DID NOT confirm that he is on the list of 7. For all we know he could be on the "list" in PJ's head. So my theory is that the true RJ or list of true RJ suspects is kept hidden in the most secure place PJ knows, his head.

It is now PJs turn to play with RJ.