Weyland-Yutani's factories are very, very, very clean.
The largest area is an assembly line where the products are assembled. That in turn is broken up into different areas for assembling different products.
A much smaller area is where the microchips are grown and soldered into the circuit boards. The entire area there is tended to by robots (except for the soldering part; that is done by living workers). Thus Jayden would not be allowed in there without wearing a special "clean suit" and going through an "air shower" so he does not contaminate the chips.
The other thing that should be noted is that the electronics industry uses a lot of toxic materials.
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Well, there was that Dragonstorm individual who attempted to get into your guys' car, I was thinking he/she (or that Dalmatian bystander) wrote down the license plate and traced you guys back to the hotel, and a small team is dispatched to check you guys out. They infiltrate the hotel, and either one of them goes rogue and tips you guys off, or one of your characters discovers them on their own. Either way, a gunfight breaks down and one of them reveals themselves to be Shelton before you kill him.
Wait, so Shelton ends up getting dragged along with this "hit team"?
I was thinking of an attempted hijacking just as they enter Culeston. The group successfully kills the hijackers but one survives. That sole survivor will either be Shelton or someone who reveals Lab 101's location.