Have you actually read the affidavit? I have. They assume the specious assertion of racial profiling as a "fact." They imply the police dispatcher has some kind of authority that was disregarded (never mind they have no authority to tell anyone to do anything; my sister is one so I know for sure). They actually give weight to the girlfriend's statement without anything to back it up. They give credence to Trayvon's mother saying the yelling voice on the 911 recording is Trayvon's, without regard for the initial dismissal by his father, two of George's relatives and an eyewitness.
In other words, there was no investigation. Not by Angela Corey and her posse of tards, anyway. This has been a production of race-baiting lefties from start to finish and Dershowitz is right in that a reasonable judge will throw all of this nonsense out.