I find the lineup of witnesses enlightening: first George, presumably testifying, at a minimum, about the car and what he may know about what was in it, then the dog handler, presumably testifying, at a minimum, about what the dog(s) alerted to during the search of the car and yard, etc., then the FBI agent, presumably about various testing that was performed, and finally the lead detective, presumably testifying about Casey's absolute failure to help with the investigation, etc.
VERY TELLING - they've laid out a story for the GJ.