Fernando: I'm retired motilium canada As a legal matter, self defense is what is called an affirmative defense, meaning the defense team is required to present some evidence to support it. But the threshold is very low and no one challenged that they met that standard here. Zimmerman’s injuries and the testimony of certain key eyewitnesses were more than enough, placing the prosecution in the unenviable position of having to disprove self-defense beyond a reasonable doubt.