San Francisco supervisors pressed city departments Thursday for a coordinated plan to address open-air drug dealing, arguing that police crackdowns have shifted drug activity between neighborhoods without resolving it. Supervisors Rafael Mandelman, Jackie Fielder, Matt Dorsey and Bilal Mahmood sponsored the hearing, seeking citywide coordination and measurable goals for the response. They said enforcement in the Tenderloin and South of Market has contributed to spillover into districts including the Mission. Mayor Daniel Lurie’s office did not send a representative, despite Mandelman’s request. Officials from the Police Department, Department of Public Health, Office of Economic and Workforce Development, and BART attended, but the mayor’s absence left supervisors without answers about how the administration is coordinating its efforts. “This is not exactly the meeting I was hoping for,” said Mandelman, who represents District 8. The decision not to send a staff member made it “hard” for supervisors to feel they were being engaged on the effects of drug activity in their neighborhoods, he said. Police Deputy Chief Scott Biggs acknowledged that enforcement in the Tenderloin and SoMa can displace people who use or sell drugs to other areas, including the Mission. Staffing shortages make it difficult for police to keep pace as activity moves, he said. “We’re not as fast as the activity shifting into other areas.” Biggs presented data showing that arrests of people using drugs substantially outnumber arrests of dealers. Asked about a sharp decline in dealer arrests, he said dealers have been more active at night, when staffing shortages limit enforcement. Fielder, who represents the Mission, questioned whether the city’s approach was effectively making her district a place to contain the problem. “I’m not sure what the city’s strategy is for responding to drug use other than letting places like the Mission be a containment zone,” she said. She said the mayor’s office should have been present to explain its approach. Lurie made cracking down on drug markets a priority after taking office. But enforcement at the Mission’s 16th and 24th Street BART plazas has previously been followed by a temporary pause in illegal activity, with conditions returning after officers leave. The hearing’s supervisors argued that neighborhood-by-neighborhood operations cannot substitute for a citywide strategy. Public health officials pointed to an increase in the number of people receiving treatment. Biggs said police have also been taking people to the Rapid, Enforcement, Support, Evaluation and Triage Center, known as RESET, as an alternative to arrest and a possible path to treatment. The sobering center opened six months ago. The center’s eligibility rules may limit access, Mandelman said. People must be at least 18, arrested for being under the influence of alcohol or drugs, free of active warrants, and not showing violent behavior or medical needs. Recent reporting has also found the facility is empty much of the time. Mandelman called for the hearing to continue before the full Board of Supervisors and said he hopes the administration will respond before his term ends in December. “I do think this is — if not the most important — one of the most important issues facing the city,” he said.