Though it makes for good television the CIA is specifically forbidden from operating within the borders of the United States by the National Security Act of 1947.
When Trevor Gurin enters the bathroom of the house of a CIA station chef, he can be seen having a weapon which is a BB Gun. Green Gas valve can be seen under the magazine when he places it (around time stamp 13:38).
The last truck is said to be northbound on tujunga near the 101 in Los Angeles. tujunga ave. is a main thoroughfare, mostly four lane with a painted divider, flanked by mostly commercial. the truck is shown driving through a residential neighborhood, eastbound by shadows and lighting. at least they managed to be close to a fwy overpass,
Simone Clark (Niecy Nash) makes several mistakes as a trained agent, even a trainee, when she and Nolan (Nathan Fillion) apprehend the bomber. She holds the gun wrong, she doesn't keep it on him to cover Nolan, she moves too close into the bomber while Nolan is cuffing him, and she holds the pistol pointing high when shooting at the CIA agents.