UPDATE: Robert Marcus, spokesperson for the D.C. Attorney General’s office told DCist on June 23 that prosecutors dismissed Ngyen’s charge without prejudice, meaning it can be brought again or other charges can be brought.

He said he couldn’t comment further about the case o rationales behind the decision.

ORIGINAL: Police say a man was paying people to withdraw their blood without the proper certification in Southwest.

Officers arrested 43-year-old Khoa Hoang Nguyen on Wednesday morning after he told police that he’d been withdrawing and storing “large quantities of blood” inside of an apartment on P Street SW, according to a Metropolitan Police Department report. At the scene, officers also found several needles, vials, and a ledger.

Neighbors told NBC Washington that a long line formed outside of the apartment building where Nguyen was paying people $30 each for the blood samples.

One man said that people were getting blood taken from their arms and had tubes placed down their noses— “some people came out of the house and said my nose was burning,” he said.

Another neighbor was concerned about people contracting blood diseases “and going away from here without nobody knowing with actions like that—to me, it was illegal, unsanitary, and unsafe.”

When police were called to the scene, Nguyen told them that he worked for a medical company in Boston, but he was unable to provide them with proof, according to charging documents obtained by NBC Washington.

As part of a “work study” program, he told them that he’d drawn blood from 40 people between Tuesday and Wednesday, however, police found a record in the apartment that listed an additional 205 names, according to the charging documents. Police also said that the blood wasn’t being stored in a way that lines up with “professional practices.”

It’s unclear why Nguyen was collecting the blood.

Police charged Nguyen with practicing registered nursing without a license, according to MPD spokesperson Aquita Brown.