Authorities searching for missing mother Stacy Peterson executed search warrants to review a GPS system in her husband's sports utility vehicle and seek physical evidence, according to a report.

Stacy was reported missing on Oct. 29 after failing to show up at a friend's house.

Drew Peterson, a former police sergeant, is a suspect in his wife's disappearance. He denies any involvement in her disappearance and claims she left him for another man.

Click here to read the report in The Chicago Tribune.

Officials served a warrant on Peterson Tuesday, asking for the seizure of items containing plastic shavings, blood, bodily fluids, fingernail scrapings, palm or fingerprints, chemicals that may alter body decomposition and other "biological material that may be evidence of the offense of first-degree murder."

Authorities initially seized iPods, computers, backpacks, 11 guns, a 2002 Pontiac Grand Prix and a 2005 GMC Yukon Denali.

A Nov. 1 warrant called for "all GPS records, cellular service records, logging records or any other electronic records in the possession of OnStar Inc." from a 2005 GMC Yukon Denali driven by Drew Peterson.

The newest warrant requested objects of blue plastic, lead weights, plastic shavings and scuff marks, circular impressions or carpet indentations or other plastic or barrel-like object.

It also lists dirt, gravel, soil and other material that might be tested to determine a vehicle's presence at a certain location; also guns, ammunition, knives and ropes that may have been used as a weapon or restraint, according to the Tribune..

The warrant seeks object 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."

Joel Brodsky, Peterson's attorney, said the first warrant allowed authorities to search the cars but not seize them. The Tuesday warrant corrected that error.

On Wednesday, law enforcement search teams searched the freezing waters of the Illinois Michigan canal with boats and divers for signs of Stacy Peterson.

Crews used three boats to search the waterway in Lockport, Ill., for Peterson.

Illinois State Police notified Stacy Peterson's family about the canal search, Pam Bosco, a family spokeswoman, told FOXNews.com. A sonar search led authorities to the area, Bosco said.

"There were things there, and they wanted to investigate," Bosco said, adding that she didn't know of anything specific that led authorities to the canal.

Illinois State Police confirmed that it is the lead agency in search efforts, but would not comment on the canal search. "Our missing person investigation is ongoing," Illinois State Police Sgt. Luis Gutierrez told FOXNews.com.