Police officers could be banned from conferring in the aftermath of fatal shootings like that of Mark Duggan.
The Independent Police Complaints Commission says it plans to issue new guidance advising that officers should be separated before they give statements about what happened.
Conferring among officers has been a controversial issue in a number of cases, including the death of Brazilian electrician Jean Charles de Menezes.
– IPCC spokeswoman
"It's our view that officers should be separated in death cases before they give their accounts."
The Prime Minister told David Lammy: "I am always prepared to look at reforms of organisations like this. There was a big reform some years ago to make the IPCC much more independent. You are shaking your head saying it isn't working, I'm very happy to look at arguments."
David Cameron says he is prepared to look at reforms of the police complaints system after errors were found in the case of Mark Duggan.
The Prime Minister was urged to look into the current system by Tottenham MP David Lammy at Prime Minister's Questions.