SAN ANTONIO - A bill allowing for so-called "school marshals" to have access to a gun on school ground is headed to Texas Gov. Rick Perry's desk after it cleared the Senate Wednesday on a 29-4 vote.The bill, sponsored by Rep. Jason Villalba, a Republican representing District 114, was passed by the house on May 5.This bill allows for anyone already in a school, such as a coach or a teacher or a v