George Zimmerman Divorce: Arrested outside his wife's parents house with gun

After she was on TV talking about her wanting a Divorce and why, George Zimmerman showed up at her parents house and the police were called.  He had a gun.

http://www.addictinginfo.org/2013/09/09/breaking-george-zimmerman-taken-into-custody-after-allegedly-threatening-wife-with-gun/

A blow by blow account.  Why is this guy allowed to have a gun?

http://www.cbsnews.com/8301-504083_162-57602050-504083/george-zimmerman-taken-into-custody-after-incident-with-gun/