One of the officers involved was suspended; the other two were placed on administrative duty. On Tuesday, the police did not specify which officer was suspended.

At a news conference on July 19, Baltimore’s police commissioner, Kevin Davis, said the idea that officers might plant evidence at a crime scene was “as serious as it gets.”

The police department shared additional videos from that day in January that seemed to show officers seizing illicit drugs from people near the crime scene. Commissioner Davis suggested that it was possible the officers had found a bag of capsules in the alley without recording it, and had tried to stage a re-enactment of the scene as it actually happened. The department is still investigating the episode.

State attorneys may also have another video on their plate similar to the one from January, according to the Maryland Office of the Public Defender, which said in an emailed statement on Monday that body-camera footage showed a different set of Baltimore officers “working together to manufacture evidence.”

That footage, recorded in November 2016, appeared to show officers thoroughly searching the driver’s side of a vehicle without finding anything, and then searching it again about 30 minutes later and finding illicit drugs.

The episode resulted in an arrest of a woman, Shamere Collins, whose lawyer, Joshua Insley, said the charges against her were dropped on Monday.