By JAMIE STENGLE Associated Press Writer February 10, 2003, 4:31 PM EST LUFKIN, Texas -- A Texas law enforcement officer was arrested Monday on federal charges he stole pieces of space shuttle Columbia. Harrison County Constable Robert Hagan II, 45, became the third person charged with looting shuttle debris that dropped onto the countryside. Hagan was charged with theft of government property for allegedly taking a piece of tile and other debris while helping with the recovery effort Feb. 1 and 2 in the Nacogdoches area. "It is a particularly troubling day when an individual who swore to uphold the...