General view of Dr. Peter Jatlow, director of the clinical laboratory, and technologist Ying-Lin T. Gravel examining the graphical output of a Perkin-Elmer fluorescence spectrophotometer in use at the Yale-New Haven Medical Center. Per notations accompanying the photograph, the instrument is being used to scan narcotics levels in a urine sample as part of a monitoring program administered by the Center's Drug Dependence Unit.