PBS
ORG
PBS
 Mr. Birnbaum, Mr. Schermbeck, both of them said, they had strived for an evenhanded approach, one they had used in their only previous collaboration, a 2003 film for the PBS series ''P.O.V.'' about high school drug testing in Lockney, Texas.  Nonetheless, they had strived for an evenhanded approach, one they had used in their only previous collaboration, a 2003 film for the PBS series ''P.O.V.'' about high school drug testing in Lockney, Tex.