Starting in at least the late 1990s, ... City and BPD leadership responded to the City's challenges by encouraging "zero tolerance" street enforcement that prioritized officers making large numbers of stops, searches, and arrests—and often resorting to force—with minimal training and insufficient oversight from supervisors or through other accountability structures. These practices led to repeated violations of the constitutional and statutory rights, further eroding the community's trust in the police.
...
"BPD's legacy of zero tolerance enforcement continues to drive its policing in certain Baltimore neighborhoods and leads to unconstitutional stops, searches, and arrests. Many BPD supervisors instruct officers to make frequent stops and arrests—even for minor offenses and with minimal or no suspicion—without sufficient consideration of whether this enforcement strategy promotes public safety and community trust or conforms to constitutional standards. These instructions, coupled with minimal supervision and accountability for misconduct, lead to constitutional violations.