A very good episode of The Mentalist, one that reminds me a lot of the first season. The level of disbelief you need for this episode is reasonable. Sure, positive pressure suits would have been nice, but they aren't exactly wonderful for character development. The complaint of the virus being let loose through the door can be explained by the closing procedure (close one door before you open the other), and by keeping the room at a different (negative) pressure from the entryway, thereby not allowing the virus to leave. Again, this is TV, small things like this can be ignored for the sake of the story.
Mystery was solid, I was quite sure it was going to be the bureaucrat guy, what with being at a generally low level (no picture on the ID card) and angry (controlling/bullying others to make himself feel better) man. His mentioning of possible thievery right away also put him high up on the suspect scale.
Quite a satisfying reveal, spilling the substance would be an excellent way to cover your tracks. They didn't really focus too much on figuring out who the killer was through the show, rather Jane chose the sensible thing and made the killer show himself. The open eye scanners made the list of suspects too large to analyze, and eliminating one person from such a large group is much easier than finding the one person responsible. Providing the fire bombing as a way of starting a new life with your riches was obviously very tempting for such a greedy man, forcing him to jump at it.
Character development was decent, you can see Jane does care about people, at least enough to make that girl go and grieve with a friend. The death probably also reminded him of his wife and daughter, and brought him back to their last moments. Did the daughter know what was happening, or was Red Jon merciful and killed her in her sleep. Tough way to go through life.
Lisbon was suspicious from the get go, and I'm surprised she only punched him for lying to her like that. Quite a serious breach of trust, especially from the guy who has told you to trust him numerous times.
Anyways, solid episode, I hope the next one is just as good. Too bad we'll have to wait two weeks again. CBS seems to want this show to fail.