I have not caught up reading on this thread yet, but wanted to put my 2 cents worth in on the bodily fluid and maggots on the outside of the trash bag containing the pizza. The tow yard manager threw the bag into the dumpster, IIRC. There was some time inbetween when the bag was thrown into the dumpster and when LE retrieved it. It was the night of the same day, but once the bag hit the dumpster out of the car, the defense could say that anything could have happened to it. This is actually breaking the chain of evidence from the car. This is going to cause a problem at trial I think. It is an interesting question and one I wish an expert would answer.
Logic says that if there is a witness - ie, the tow yard manager - that the bag came out of the trunk of Casey's car, and that bag had maggots on it, that it would be the same bag. Chain of custody means so much. Just watch and see - if that is big evidence that the SA wants to present at trial - then the defense is going to make a big deal out of the chain of custody of evidence. From the time the bag left Simon Burch's hands and into the dumpster, there was a period of time that the bag was unattended in a dumpster.
I may not be explaining my concerns about the trash bag very well, but does anyone see what I mean? IFFY chain of custody of evidence at best.