Police investigating Casey Anthony for the alleged murder of her daughter Caylee, now admit they made a huge error during their investigation. Investigators failed to notice that someone using the Anthony family computer had conducted a search for "fool-proof suffocation" on June 16, 2008 -- the same day Caylee was last seen alive.

Orange County, Florida Captain Angelo Nieves said on Sunday that his computer investigators found only 17 entries from Anthony's family computer's Internet Explorer browser, but failed to check the Mozilla Firefox browser, which had more than 1,200 entries, including the "suffocation" search, reports WKMG-TV.

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Meanwhile, on March 17, 2008, months before the toddler's disappearance, the words chloroform, neck-breaking, head injuries, ruptured spleen, chest trauma, inhalation and internal bleeding, were all searched on the family computer.

It is not known who performed the searches, but it was allegedly done with Mozilla Firefox used by Anthony, who was acquitted of her daughter Caylee's murder in 2011.



Whoever performed the searches, also looked for the term 'fool-proof suffication' and then clicked on an article about suicide that discussed taking poison and putting a bag over someone's head.

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A computer expert for Anthony's defense team found the search before the trial. Anthony's attorney Jose Baez mentioned the search in his book about the case, but suggested it was George Anthony who conducted the search after Caylee drowned.



However, the Mozilla Firefox also recorded activity on the social networking site MySpace, which was used by Casey, not by her dad George.



Prosecutors claimed that Caylee was poisoned with chloroform and then suffocated by duct tape placed over her mouth and nose. Caylee was found months later in a field near the family home.



Casey Anthony's mother, Cindy, claimed on the witness stand that she had done the searches on Internet Explorer by mistake while looking up information about chlorophyll.



The sheriff's office didn't consult the FBI or Florida Department of Law Enforcement for help searching the computer in the Anthony case.

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