Siebach faces a maximum 10 years in state prison, a maximum two-and-a-half years in a house of correction, or a fine between $1,000 and $10,000 for possessing LSD with intent to distribute.

Siebach also voluntarily gave the officers a bag of marijuana, Catalano said.

The additional marijuana charge carries a sentence of no more than two years in prison, or a fine between $500 and $5,000, or both.

Siebach was also charged with a drug violation within a school zone, which carries a minimum sentence of two years in prison and a maximum of 15 years. The University-affiliated Radcliffe Child Care Center on the first floor of DeWolfe is across the street from Quincy.

Quincy House Master Robert P. Kirshner ’70, Harvard College professor and Clowes professor of science, said Saturday that he did not yet have a full report of the incident but that “as always, our first concern is for the health and safety of everybody in the House.”

John McMillan, resident tutor in Quincy, confirmed that he witnessed the arrest but did not want to comment further.

“I was present when the student was arrested but didn’t have any involvement,” he said.

Theresa H. Cheng ’08 was in Quincy House during the incident and saw the HUPD officers arrive at the scene.

“I saw cops in the entryway,” she said. “I knew something was up because of that. I saw two cops and this other guy in a suit—I didn’t know who he was. I was just warned not to go upstairs.

Cheng, who knows Siebach and his roommates, said they are well-liked and that she was surprised to hear of Siebach’s arrest.

“[It’s] definitely a surprise,” she said. “They’re amazing people.”

Neither the hospitalized student nor Siebach responded to requests for comment Saturday afternoon. Siebach is slated to appear in court for his arraigned today.

—Staff writer Marianne F. Kaletzky can be reached at kaletzky@fas.harvard.edu.