Sept. 4, 2008 -- The mother of missing toddler Caylee Anthony is expected to be released Friday morning for the second time in two weeks.
The Orange County, Fla., Corrections Department said Casey Anthony will probably be released by midmorning Friday.
Court documents show that Anthony's parents, George and Cindy Anthony, put up part of the collateral for her release from jail. The source of the money was not immediately clear. Joe Von Waldner, the Orlando bail bondsman who posted Anthony's bond, told ABCNews.com that he was working on behalf of a surety company, which he declined to name. Von Waldner said he was working with another bail bond company called MacDonald Bail Bonds, which declined to comment.
For more exclusive photos and home videos of Casey and Caylee Anthony, watch "20/20" Friday at 10 p.m. ET.
Anthony's release will be the second time in a matter of weeks that the 22-year-old mother has been freed from jail. A California bounty hunter arranged for bond to be posted for Anthony, who was being held on charges including child neglect and making false statements, and she was released last week.
Anthony returned to jail last weekend after her bond was revoked. The bounty hunter, Leonard Padilla, had said that Anthony had been uncooperative since her release from jail.
On Thursday, the Orlando Sentinel reported that traces of chloroform reportedly were found in the trunk of a car driven by Anthony.
The paper, citing unidentified sources, said that preliminary FBI tests found the chemical in Anthony's car trunk. Law enforcement sources had previously told ABC News that air-sample tests from the trunk found evidence of human decomposition.
The paper also reported that there was evidence that Anthony may have searched for information about the chemical on her computer.
Chloroform, once used as an anesthetic, can cause a person to pass out. High doses can be fatal.
Anthony has been called a "person of interest" in the disappearance of her daughter, but has not been charged in connection with Caylee's disappearance.
Calls to Anthony's lawyer by ABC News weren't immediately returned.
Police have been searching for Caylee since July, and the Orange County Sheriff's Department has said that it believes she is probably dead.
Anthony has given the police changing and inaccurate information about the case, according to investigators.
Police last month said hairs the same length and color as Caylee's were found in the trunk of the car, and Anthony's mother, Cindy Anthony, said in a 911 call in July that the car smelled like there had been a dead body in it.
Cindy Anthony has since retracted those comments, saying the smell could easily have been from garbage in the car.
Last weekend, Anthony was sent back to jail on new charges, including petty theft and use of a forged check. The $500,000 bail, posted by a California bondsman who released Anthony from jail, was also rescinded.
On Wednesday, the Sheriff's Office charged her with additional check fraud and theft counts.