Pennsylvania's expanded castle doctrine was enacted in 2011. Governor Tom Corbett signed the self-defense bill into law only months after his predecessor, former Governor Ed Rendell, vetoed the legislation.
Self-defense statutes like the castle doctrine and stand-your-ground laws gained notoriety this summer as George Zimmerman stood trial for the shooting death of Trayvon Martin. Interestingly, Zimmerman did not raise stand-your-ground as a defense during his Florida murder trial, although the judge included the phrase "stand your ground" in her instructions to the jury.
