According to Marine, toxicology screens range in their comprehensiveness, some testing for 10 to 12 substances, others for as many as 150. Marine said Harvard should examine the frequency with which it recommends the more wide-reaching test.

“It’s purely a matter of logistics: what are we doing now and what do we need to be doing,” she said.

Rosenthal said intoxicated students are routinely subjected to toxicology tests, but that of the one to three such tests administered every week, the vast majority only test for alcohol.

“There is a drug or a toxic screen that is part of the routine procedures, [but] there are many things the screen will not pick up unless specifically asked for,” Rosenthal said. He did not provide specific statistics on the frequency of tests for Rohypnol or similar drugs.

Rosenthal said that UHS does not conduct such tests on site but that results can be back from an outside lab within hours—even late at night if they “felt it was urgent.”

Rosenthal said he has not received an official complaint regarding UHS’ care in the recent incidents, and urged the student or a representative to come forward if they feel that UHS mishandled the case.

“If this is a complaint, or if there’s any concern about the health care that someone received at UHS, the individual or a legal representative of that individual should alert me to it so I can do a full peer review of the issue,” he said. “We would obviously be concerned about that and would take action. But I can’t take action on second-hand or third-hand information.”

Rosenthal encouraged students to seek one of several avenues of confidential complaint, including the UHS patient advocate or the Student Health Advisory Council.

—Staff writer David B. Rochelson can be reached at rochels@fas.harvard.edu.