Help, I'm Stuck- Warrick keeps talking about what I can learn from the truck

[Lil Peanut]

I have gone to all six locations. Talked to all three suspects. All anyone tells me now is that they have nothing else to say. Grisom is supposed to be going over to the garden. How long do you have to wait for him to get back? The only thing I can ask Warrick is "what do I learn from the truck" and he replys analyze all the evidence. I have had the wood chips, receipt, dirt sample analyzed and compared the tire print to the two ones from the crime scene and garden. What am I missing? THANKS!

[thekay]

Have you swabbed and analyzed [via Greg] the sticky brown substance from the flatbed of the truck?- it is different from the dirt sample from the demo gardens [near the tire tread].

I think that is all you are missing- getting that should trigger more info from the subspects in interrogation.