RT Article T1 Drug testing welfare recipients--false positives, false negatives, unanticipated opportunities A1 Pollack, Harold A. A2 Seefeldt, Kristin S. A2 Jayakody, Rukmalie A2 Danziger, Sheldon 1948- LA English YR 2002 UL https://krimdok.uni-tuebingen.de/Record/1912523426 NO 1878-4321 DO 10.1016/S1049-3867(01)00139-6