The Google search for "fool-proof" suffocation methods in June 2008 was made from a computer in Anthony's home. Anthony was acquitted in 2011 of the murder of her daughter, Caylee. It is not known who did the search, but an Orlando TV station reported that it was done on a browser primarily used by the girl's mother.
Investigators reportedly pulled 17 vague entries only from the computer's Internet Explorer browser, not the Mozilla Firefox browser commonly used by Casey Anthony. More than 1,200 Firefox entries, including the suffocation search, were overlooked.
Whoever made the search clicked on an article about suicide that discussed taking poison and putting a bag over one's head.
Anthony's attorneys argued during trial that she helped her father, George Anthony, cover up the girl's drowning in the family pool.
A computer expert for Anthony's defense team found the search before the trial. Her lead attorney, Jose Baez, first mentioned the search in his book, but suggested it was George Anthony who conducted the search after Caylee drowned because he wanted to kill himself.
During Anthony's trial, prosecutors argued Caylee was poisoned and then suffocated. An exact cause of death was never determined because the girl's body was too decomposed when it was found six months after she disappeared.
The Associated Press contributed to this report.
