Originally Posted by Minor 4th
Maybe. I don't think the prosecutors ever actually got to interview Matt. My guess is that after the coded messages were discovered, he plead the 5th and refused to answer questions. Obviously he is not going to testify for the prosecution that he was lying for Jodi or that he was complicit in her plan to offer false testimony or evidence (forged letters).
When JM was questioning JA re: the hidden messages in the magazines that she tried to give AC, he did ask JA if she knew that Matt had been interviewed by the prosecutor within about a month of the August 2011 court hearing. He also referenced a phone call that she had made to Matt from the jail about that interview, prior to it taking place. This is at ~42 minutes into the third part of Thursday's testimony.
Once the coded messages were discovered, Matt probably did plead the 5th, but apparently not before JM had interviewed him.