It's called reasonable doubt... Forensic evidence was tenuous at best and no witnesses ever tied Ms. Anthony to Caylee’s murder. Investigators found no trace of DNA or solid signs of chloroform or decomposition inside the trunk. Plus the fact that nobody knows exactly how Caylee died; her body was too badly decomposed to pinpoint cause of death. The evidence was circumstantial at best. And quite a bit of the evidence pointed to the grandparents. Whether you think she's guilty or not you'd be VERY hard press to convict her on the case and evidence that was presented. Just because the media convicted her doesn't mean she was guilty.....