Had the defense been prepared to make this argument -which understandably they were not – they could have removed Tracy from seeing/listening to witness testimony based on him giving intentionally and factually incorrect statements to Law Enforcement.
Skip video to 18:00 for the ruling and understanding of precedent used by Nelson to establish grounds for ruling:
Using the Beasley case as citation, the lie told by Tracy Martin about driving Trayvon 1/2 way to Sanford during his sworn statement to Law Enforcement on April 2nd 2012; which is now conclusively shown as a false statement with evidence submitted by the State of Trayvon Martin’s phone records of him taking the bus the whole way and texting his sitting at the bus-stop waiting for Brandi Greene to pick him up; Tracy Martin – as a potential trial witness – could be excluded (sequestered) from the courtroom.
Of course the point is now moot – but could still be argued if the Defense wanted it to be.