Could this key evidence free Steven Avery? The official Twitter account behind the documentary Making A Murderer revealed that Steven's new attorney, Kathleen Zellner, is going to use new tests to help prove her client is innocent.

Steven Avery's new attorney @ZellnerLaw plans to use advanced luminol testing to exonerate Avery. pic.twitter.com/o2sRaNVmwu

— Making A Murderer (@MakingAMurderer) February 10, 2016

Luminol testing is used to see if blood is present at a crime scene, that isn't detectable with the naked eye. During the testing a light is used to illuminate any traces of blood. If they conduct the luminol testing on Steven's garage and can show that no blood is present, it could help prove that Steven did not murder Teresa Halbach and exonerate him of the crime. Ms Zellner recently told The Wrap, "We are continuing to examine every aspect of Mr. Avery’s case and all of his legal options. We are confident Mr. Avery’s conviction will be vacated when we present the new evidence and results of our work to the appropriate court." Just last night the Twitter account also updated fans of the documentary with another crucial bit of information, that Agent Fassbender had asked the DNA analyst to 'connect Teresa to Steven's house or garage'.

DNA Analyst Sherry Culhane testified that Agent Fassbender asked her to connect Teresa to Steven's house or garage. pic.twitter.com/Tr4kAUgReq — Making A Murderer (@MakingAMurderer) February 11, 2016