Obviously she can't tried for the same crime again but this new evidence came out this week:

Capt. Angelo Nieves acknowledged the WKMG-TV report that his office’s computer investigator missed a June 16, 2008 Google search for “fool-proof” suffocation. That was the last day 2-year-old Caylee Anthony was seen alive.

WKMG reported that the sheriff’s investigators pulled 17 vague entries from Anthony’s Internet Explorer browser. However, they never looked at the Firefox browser that was commonly used by the “Tot Mom.” More than 1,200 Firefox searches, including the one for “fool-proof suffocation,” were overlooked.

Whoever conducted the search misspelled suffocation as “suffication.” That person then clicked an article about suicide that discussed taking poison and putting a bag over one’s head.