In the long term, Raymond said, the city is suggesting greater investment in technology to help root out unnecessary overtime expenses. This would include the use of biometric scanning to record the times officers start and end shifts and GPS tracking of all unmarked police cars, which take officers to the far corners of the city, where monitoring their hours is difficult. The Baltimore Sun reported in February that the department had begun implementing the new biometric technology, but officials said Wednesday that had not yet been carried out.