Charges will not be brought over allegations Metropolitan Police officers abused suspects during a drugs raid and took their property.
Fifteen members of the Enfield crime squad in north London were investigated after two men claimed they were beaten in November 2008.
The Crown Prosecution Service (CPS) said statements made by the pair were contradictory.
It also said the events could not have happened as described.
The CPS investigated claims by two men that they were beaten and officers tried to hold the head of one of them under water.
They also alleged the police took electrical goods and cars belonging to them.
'Head in toilet'
A CPS statement said investigators found the men's accounts substantially contradicted each other and they could not identify the officers involved.
Simon Clements said: "In the absence of reliable, corroborative evidence there is no realistic prospect of a conviction against any officer."
One suspect claimed he was assaulted during a raid at an property in Tottenham, north London.
A second man alleged his head was held in a toilet as it was repeatedly flushed.
A separate Met probe found electrical goods, thought to have included plasma TVs, were taken in the raid and stored in a police station.
The Met said in a statement: "Eight officers remain suspended whilst we now consider the CPS decision and give consideration to the instigation of misconduct proceedings.
"A recommendation will be made to the Independent Police Complaints Commission in the near future.
"The Metropolitan Police Service seeks to learn lessons from any issues identified in investigations."
- 25 February 2009