Wiki forum member hotchfanCA visits the set of Criminal minds. Here is her account of the exciting visit...
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"We got to see the set and visited Hotch and Rossi's office. Alot of the things there were under a tarp that we couldn't move because everything had to stay the same for the next time they would shoot but got my picture with another Hotch fan taken under Hotch office door with his name on a plaque on that door. Had a look via Hotch office window which give a 'nice' view of passing crew members :)

We got to see the conference room and sit at the round table. Nice room, look bigger when you are there. Then I went to Garcia's lair with Kirsten. That place is tiny! Lots of computers and got to see Garcia's impressive pens collection. Next was visiting the plane. That place is so small! I have no idea how TG and MGG can stand in there! Better not be claustrophobic!

Next was the police station of the week set that the crew was working on, lots of work going there. Very strange to enter a room that got no ceiling.

Then we went back to the BAU bullpen entrance and sat there to watch some of the actors, MGG, JM, KV and PB give interviews to the international press. They all look great especially PB who had a long black dress. When the press interviews were over all the actors came to say hi and we got to chat. They all wanted to know where we came from, how long we would be there. What I notice about everyone was how they are very friendly. They all wanted to pose for pictures with us. Had lots to talk about and ask us about. I ended up talking with Joe about traveling to L.A and how unfun it is to spend hours in a plane.

Next we went to have lunch with the crew. Everyone was very nice. later we got to sit in the writers room and watch the director cut of PIMB with Breen Fraiser, who wrote the episode and Brianna Brown the actress who played the unsub. Finally, we went back to set to watch them film some scenes. First we got to see Alex O'Loughlin do a scene. When I first saw him I didn't know who he was. Someone who was a Moonlight fan told me that he plays a vampire on TV'. Okay. He seems like a very intense actor. Didn't get to talk to him since he was shooting, then left as soon as he was done. After that scene was done, Paget and Matthew did show up for their scene. They had to wait for the crew to get thing set for their scene so they were talking with some of the crew and us. Matthew did a magic trick, asked one of us to help him. It was all funny and Matthew's good at magic tricks ;) Then TG showed up. He said hello then started to talk with some of the crew and Paget. Then they were ready to shot the scene were we see Hotch kick down Vincent's door in THE BIG WHEEL. No stuntman there and TG did kick that door with some vigor, enough to have the doorframe come out! They did that scene a couple of time.

There was another break so the crew could set the next scene. Matthew and Paget came back to chat with us, that is when Matthew told us about why he changed his gun. Paget made some joke about Matthew's reason. It was all very friendly. While we were chatting with Matthew and Paget, Thomas was on the side talking with the director about the next scene. Then we got to watch on the monitor with the director as Thomas did that scene where he is looking at the monitors in Vincent room. They did that scene a couple of time from different angles. Then we left to go to editing. We got to meet I think his name was Adam who was doing the sound editing on 'Omnivore'. It was a fascinating thing to watch him add different sound to the scene where we see Foyet tackle Morgan through that window! He did explain to us all the different sound he used to make the sound of broken glasses. After that we went back to see TG, MGG and PB work for a few minutes but sadly it was time to leave. PB and MGG came and said goodbye and gave hugs to everyone. TG came out to say goodnight and thanks for visiting and off we went :)

I have to add that EVERYONE we meet were very nice and friendly, from the crew, to the writers to the cast, all made us feel welcomed"