Police Search for Evidence in Peterson SUV

Police searching for Stacy Peterson appear have focused on the GPS navigation system of her husband's sport utility vehicle, according to a search warrant obtained by ABC News.

Illinois State Police served a search warrant Tuesday night indicating that they planned to examine two of Drew Peterson's vehicles and seize physical evidence, including items containing blood, hair, fingernails, bodily fluids or "other biological material which may be evidence of the offense of first degree murder."

The warrant also said the police were looking for any indication that Peterson, a former suburban Chicago police officer, may have moved a plastic barrel or storage container in the SUV.

Stacy Peterson, 23, was last seen Oct. 28. Authorities have called the case a potential homicide, naming her 53-year-old husband as a suspect. A relative of Peterson's reportedly helped him move a heavy container out of his home and put it the sport utility vehicle the day his wife vanished.

Peterson's lawyer, Joel Brodsky, has denied the allegation, according to The Associated Press.

Peterson has repeatedly denied involvement in his wife's disappearance. He has said that he believes that Stacy Peterson left him for another man.

Police have previously searched Peterson's home and have seized some of his property, including computers, a 2002 Pontiac Grand Prix and a 2005 GMC Yukon Denali driven by Drew Peterson. An earlier search warrant indicated that police were searching for records from the company that made the GPS system in Peterson's Denali.

The latest warrant, first reported by the Chicago Tribune, says that the police intend to search Peterson's GPS system, which "contains data in a format that is not easily obtained or seized."

It says that police were looking for plastic shavings, blue plastic, lead weights and other objects with scuff marks, circular impressions or any other indication that Peterson had a "plastic or barrel-like object or large storage container" in the SUV.

It also says police are looking at anything that could help them place Peterson's car at a specific location, such as dirt, gravel and soil. Cops are also looking for guns, ammunition, knives, ropes, carpet, or anything else that may have been used as a "weapon or restraint."

The warrant seeks objects that "have any of the following on them: blood, hairs, fingernails, bodily fluids, body tissue, DNA, fingerprints, fingernail scrapings, palm prints, saliva, urine, feces, or other biological material which may be evidence of the offense of First Degree Murder."

Peterson's lawyer, Joel Brodsky, did not immediately return a call for comment. He told the Chicago Tribune, which first reported on the latest search warrant, that the recent warrant only corrected a mistake in an earlier search warrant.

He said the first warrant only authorized the search of Peterson's vehicles, not the seizure of the items.