Red John is Ray Haffner (assuming it's one of the final 5 suspects).
When Red john saved patrick jane in the season 2 finale he used the phrase, "Roll tide", which relates to football. When Ray Haffner asks Cho to come to his office, there's a Heisman trophy behind him, which means Ray Haffner played football in his earlier days. Remember When lisbon asked Ray if he was at the eliston farm in 1980 something (because he was 21 and a new member of visualize), he replied, " we're still friends right?".

He has this creepy vibe and seems to be interested in Lisbon, remember Red john spared Lisbon (thank god :P).

Also, Haffner is a master of surveillance techniques and the physical descriptions fit him perfectly.

I feel when we find out who RJ is in episode 8, and most likely when Patrick gets his revenge, there will still be 5 more episodes in the season covering the "tyger tyger" conspiracy group that consists of people Like Reede smith and many other people in law enforcement. We will also get to see jisbon develop to the point where jane expresses his love to lisbon =).

Sorrry for spoilers but most of this seems true! (all this information was gathered through multiple theories on this site and watching every single episode of the mentalist more than once).

Old clue, but a really very good one:

Kristina Frye is dining with Jane and to show her psychic abilities to him, she reads a waiter and reveals the Alabama football slogan 'Roll Tide' as part of her reading.

Later, when Red John rescues Jane he recites The Tyger to him, and then in telling Jane that Kristina sends her love (i,e, revealing to Jane that he has abducted her) he then taunts Jane with Roll Tide.

There is no way that Kristina tells Red John about the reading of the waiter and what she said to him in that detail. Think about it. She is abducted and terrified no doubt. This is inconceivable. There is only 1 way that RJ knows the Roll Tide connection, and only 1 reason he says it to Jane. He has already told him he has Kristina, so by saying Roll Tide also, it is solely to taunt him that he was listening in on that lunch. Either he was at a nearby table, or more likely, he has Jane under constant surveillance and bugs. His taunt of 'Roll Tide' is to gloat about this surveillance.

Who esle do we know, amongst the 5 remaining suspects, is it factually known to be a master expert of surveillance?

RJ must be one of them in the list because we have been focusing on them for a while, but he must not be one of the list, because nobody in that list will surprise us after all.. what a paradox..

All I can say is that so far....Heller has managed to explain the Tiger, Tiger thing in a way that none of us saw coming....he also explained the Kirkland situation in a way that none of us saw coming....He also revealed that Red John discovered Jane's "happy memory" in a way that none of us saw coming....I think we should just give up on trying to guess who Red John is....so far, it's clear that we're wrong about anything else we've thought so far and Heller continues to shock us with his answers and revelations. A lot of things seem obvious, but nothing on this show is ever as it seems. Red John could be anybody, on the list or not. The only thing we can do is sit back, enjoy the ride, and let Heller surprise us all, as I'm certain he will.

Interesting clues in previous episode

1)   Hightowers aunt calls Jane a lamb. Interesting use of word here. Its in the poem, tiger tiger, it could also be seen as the prey of tiger. It clearly being used as a reference for something.

2)   Jane has Tyger Tyger said to him by a) Red John in end of season episode. Who clearly isn't red john and is just someone protecting him.  b) Todd when he dies, If it is a code word which it is, why say it to Patrick Jane....... he would have to be involved to surely say the code word to..

3)   PJ has been investigated for 9 years under the suspicion of being RJ. Yet when Kirkland had a chance to interrogate him. He didn't even ask him ;Are you red john? Also the topic was pretty much brushed off, by Hightower, as if we know its not you. Why investigate for NINE years??? If they thought it wasn't him surely they would stop? Or have they just not caught him yet.

As I have said previously the teasers have always been put in place. More reasons and facts from the show could be listed for PJ being RJ then any other character. I would much rather in the red john episode when all suspects are gathered, they turn the tables from the usual format and reveal PJ as RJ. PJ then spends the rest of the season fighting the good and bad within him, whilst being chased by none corrupt officials resulting in the breaking up of the network.. Rather than a random reveal. Of someone who is quite unbelievable in the role.

95% of the people reading this wont agree but the reality is most people will be disappointed at first whoever or whatever RJ turns out to be.

I liked Kirkland's character in last episode. Dark. Could have played this for a bit longer in previous season, then had the swerve that he was also hunting RJ

Ok, I like this website, but only newer theories are thrust to the top. After a few minutes they fall down the list.

We need a forum, a true forum, to more easily find information on our suspects. 

No matter who you think Red John is, it should be easier to get to the information you want.

Forums with sections for each theory and suspect are easy to create and free to set up.

Forget being held down to a list. Everybody has an opinion and those opinions should be expressed.

If this expression isn't going to be allowed here. We can do it somewhere else, easily. :)

The suggestion box apparently holds no weight here.

There are soooooo many fans of the show here! Let's get our brains together!

Who is on board?

Rob