"What happened?"
"We got burgled."
"WHAT?!? What's been taken?"
"Sophie's laptop. Mark's laptop. Nothing else."
"My stereo?"
"Nope."
"The DVD player?"
"No."
"Nothing else?"
"Just two laptops. They even left digital video cameras that were just....sitting out in the open. It's super-wierd."
"Was it forced entry? What happened?"
"No, nothing forced, just...gone. We live on the third floor of an apartment building. How the hell did they get through two doors?"
"You got home first?"
"Yeah, I got in around five-thirty. I didn't notice anything wrong until Sophie got home and started screaming. She's talking about moving out."
"And the door was bolted when you got home?"
"No, it was open."
"WHAT?!?"
"Rob and Chantz were here."
"WHAT?!? WHO?!?"
"Uhm, Rob and Chantz. Y'know, my old flatmates? They lived here two months ago? Before your time."
"How did they get in?"
"They have keys. They were getting some of their stuff out of the attic."
"..."
"Look, I know what you're thinking but it can't have been them. They're two of the nicest people I know. They're really lovely. It just can't have been them."
"So....you got home....and found two people who don't live here, in the house....and then you discover two laptops are gone....and you don't see the pattern here?"
"They're beyond reproach. I know them. They're good friends. This just isn't the sort of thing they'd do."
"You know them that well, to say, beyond any shadow of a doubt, that they were incapable of doing this?"
"I am one hundred percent positive. Okay ninety-nine percent positive, I mean, it'd be the oddest thing ever."
"Odder than thieves targeting the third floor of an apartment building in Hampstead and somehow gaining keyless entry?"
"Look, it just can't be them. I just can't believe it. I lived with them for five months and never got even the slightest hint of dishonesty about them."
"You've never had a mate you've known for a while and then had them turn on you?"
"Yes but I really, just, I just can't believe that about Rob and Chantz."
"I can't just take their honesty on your word."
"Well, I gave their number to the cops."
"Oh, you called the cops?"
"Yeah! CSI just left."
"CSI was here?"
"Yeah! They were both pretty cute, too."
"Were they in uniform?"
"No."
"Oh."
This is a 
I thought they were just called Detectives here.
And I don't get the title of this post.
No, we specifically asked if they were Crime Scene Investigators. They said yes, we burst into singing "Whooooo are you? Who-ooh? Who-ooh?"
They had obviously never heard this gag before.
title = occam's razor.
I think they used to call them Scene of Crime Officers... Although since they were clearly crime scene investigators, perhaps they didn't hear your capitalisation and answered the wrong question.
Gotta love Occam's Razor. Especially when Fox Mulder somehow manages to use it to prove that what seems to be a simple robbery actually involves government conspiracies to hide the existence of extraterrestrials.
I don't think that's what William of Ockham intended...