Strolla is going to stamp this technician as incompetent because he didn't use everything in every course he's ever taken when he inspected the car and because he did a course in crime scene investigation and not laws of physics
While the defense is doing a fairly good job of trying to make Det. Kipple look incompetent with regard to the fragment found 4 days later, I think Det Kipple did an EXCELLENT job of explaining when the truck goes on the flatbed, when it is taken off it is sort of "dropped down" (my words, I'm struggling tfind the right way to describe), and RIGHT THERE, if I were on the jury, could easily explain why the fragment was found later. It could have been jarred and not found the night of the murder, at the crime scene.
It's just impossible. The boys could not have stashed or ditched a large gun without anyone noticing. There were too many cops, witnesses, LE standing around, processing the truck then they moved it away. When could the boys have gotten their giant shot gun out and hidden it or handed it off to a family member? Was a lonely shot gun ever found in the plaza? Or anything similar? Occam's Razor says if there wasn't a shot gun found, then there never was one. If they never shot back when they were being shot at it's because they never had a gun to shoot back with. A 4-inch pocket knife is not a shot gun. Strolla is doing his damndest but this is about common sense.