He licks his lips tentatively - that's a bit of a sticky issue and if Shawn were a little more in tune with his father's cues, he'd notice the nerves right away.

"Karen." He nods slowly; "She went through the front doors on a coffee run the same time I went through the evidence room door. And then the other day we went again."

He slams the locker closed - eyes fixed on Shawn.