A man apprehended by police in an east London shop did not swallow a controlled substance before he died, the police watchdog has said.
Rashan Charles was followed by officers in Dalston on 22 July and became ill after putting an object in his mouth.
His death sparked a number of protests, including one which turned violent.
An item removed from his airways was not a controlled substance, the Independent Police Complaints Commission has found.
It did not reveal what the item was but said it was awaiting the preliminary results of a post-mortem examination, which was carried out on Monday.
“The IPCC has now received results of forensic analysis of an object that was removed from Rashan’s airway by paramedics,” a statement said.
“The object did not contain a controlled substance.”
Mr Charles’s family has been informed.