Steven Avery's new lawyer is using this forensic test to show he's innocent

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'Making A Murderer' Bombshell: Will New Evidence Be Revealed? (Access Exclusive)

Steven Avery's new attorney, Kathleen Zellner, has said she's looking to science to prove the "Making a Murderer" subject innocent — but she has been pretty quiet about exactly how.

Now we know at least one test that could prove significant.

Zellner is testing Steven's home and property for minute traces of blood using a chemical called luminol, Steven's brother Earl Avery told "Access Hollywood." "They sprayed the whole house," he said.

Luminol, which wasn't available to investigators during Steven's 2007 trial, glows when it detects the iron found inside red blood cells and remains effective when used at a crime scene years after the crime was committed there.

"The degradation that happens in a blood sample over time doesn't affect the iron. So a luminol test can be used on very old, very dried blood samples and still give a very good positive," criminal justice professor Nathan Lents, who is not involved in the Avery case, told the TV show.

Learn more about Steven Avery's case:

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Steven Avery's trial from "Making a Murderer"
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Steven Avery's new lawyer is using this forensic test to show he's innocent
Steven Avery looks around a courtroom in the Calumet County Courthouse before the verdict was read in his trial, March 18, 2007, in Chilton, Wis. Avery was found guilty of first-degree intentional homicide in the murder of photographer Teresa Halbach. Avery, who spent 18 years in prison for a rape he didn't commit only to be convicted of committing a murder 3½ years after he left prison, said Tuesday, April 17, 2007, he is confident he will again be exonerated. (AP Photo/Jeffrey Phelps, Pool, File)
This March 2007 file photo shows Calumet County District Attorney Kenneth Kratz giving his closing argument in the Steven Avery trial in the courtroom in Chilton, Wis. Police say Kratz sent repeated text messages trying to spark an affair with a domestic abuse victim while he was prosecuting her ex-boyfriend. (AP Photo/Morry Gash, File)
Karen Halbach, mother of Teresa Halbach, listens Tuesday, April 24, 2007, to testimony in the Brendan Dassey trial in Manitowoc, Wis. Dassey, 17, is charged with first-degree intentional homicide, mutilating a corpse and first-degree sexual assault in the death of 25-year-old Teresa Halbach on Oct. 31, 2005. His uncle, Steven Avery, 44, was convicted last month in Halbach's murder and is to be sentenced to mandatory life in prison in June. (AP Photo/Bruce Halmo, Pool)
Karen Halbach talks to the jury about her slain daughter, Teresa Halbach, during the trial of Brendan Dassey, Monday, April 16, 2007, at the Manitowoc County Courthouse in Manitowoc, Wis. Dassey, 17, is charged with first-degree intentional homicide, mutilating a corpse and first-degree sexual assault in the death of 25-year-old Teresa Halbach on Oct. 31, 2005. His uncle, Steven Avery, 44, was found guilty of her murder last month. (AP Photo/Dan Powers, Pool)
Tom Halbach, father of Teresa Halbach waits in the courtroom for the verdict in the Steven Avery Trial Calumet County Courthouse Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Patrick Ferron, Pool)
Sgt. Mark Wiegert with the Calumet Sheriff Department, testifies during Steven Avery's trial on Wednesday, March 7, 2007, at the Calumet County Courthouse in Chilton, Wis. Avery, 44, and his 17-year-old nephew are accused of murdering 25-year-old photographer Teresa Halbach and burning her body on Halloween 2005. The nephew, Brendan Dassey, is scheduled for trial in April. (AP Photo/Evan Siegle, Pool)
Steven Avery's attorney Dean Strang points to a photo showing a CD case that contained blood stains in Teresa Halbach's vehicle while questioning Nick Stahlke, a blood spatter expert with the Wisconsin Crime Laboratory during testimony in Avery's murder trial Tuesday, Feb. 27, 2007, in Chilton, Wis. Avery is accused of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Blaine Dassey, Steven Avery's nephew and the brother of Brendan Dassey testifies Tuesday, Feb. 27, 2007, during Avery's murder trial in Chilton, Wis. Avery is accused of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Manitowoc County Circuit Judge Patrick Willis listens to Steven Avery's attorney Dean Strang argue a point during Avery's murder trial Tuesday, Feb. 27, 2007, in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Marc LeBeau, unit chief of the FBI's chemistry unit, testifies in the Steven Avery homicide trial Monday, March 5, 2007, at the Calumet County Courthouse in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Mike De Sisti, Pool)
Steven Avery, left, exits the courtroom after closing arguments in his trial, Thursday, March 15, 2007 at the Calumet County Courthouse in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Dwight Nale, Pool)
Calumet County District Attorney Ken Kratz answers a question after the murder trial of Steven Avery Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Jeff Phelps, Pool)
The hands of Tom Halbach, father of Teresa Halbach, are shown as he waits for the verdict in the Steven Avery murder trial in the Calumet County Courthouse Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Patrick Ferron, Pool)
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"In fact, it actually gets better over time because some of the agents that would interfere with the signal get degraded, but the iron doesn't," he continued. "Iron doesn't go anywhere."

luminol bloody shoeNetflix

During Avery's trial, the prosecution alleged that Steven and his then-teen nephew Brendan Dassey tortured and raped photographer Teresa Halbach in Steven's room, and said she was shot in the head in the garage. If all that actually happened, the events probably left traces of blood for luminol to detect — even if the scene was cleaned up.

How does this help Steven? If no blood is detected by the test, then it provides reason to believe that Halbach wasn't killed in his home. If blood is found, then it will need to be tested to try to find out whose it is.

Earl is optimistic about Zellner. "Hopefully she does better than the last two," he said, comparing Zellner to Steven's previous lawyers, Dean Strang and Jerry Buting, who are prominently featured in "Making a Murderer."

"They probably did a good job, but look at where [Steven] is," Earl added.

Steven and Dassey are both serving life sentences for Halbach's murder.

NOW WATCH: The lawyer from 'Making A Murderer' describes what's wrong with America's criminal justice system

See Also:

SEE ALSO: A bomb threat seeking 'justice' for Steven Avery of 'Making a Murderer' turned up no bombs

SEE ALSO: Steven Avery's brother says the convict apologized for naming him in the Teresa Halbach murder

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