(Portland, OR)  --  Portland police say they've arrested a man who sprayed a security guard with insect spray as he tried to leave a Safeway with 700 dollars worth of groceries.  Authorities say Lawrence H. Dorris tried to leave the Northeast Portland supermarket in August without paying for the groceries when he was confronted by the guard.  Officials say after the guard was sprayed, another employee intervened and sprayed Dorris.  Dorris is charged with robbery and unlawful use of a weapon.