Speaking to MPs on the Home Affairs Select Committee, Doreen Lawrence said she had no confidence in the police and added it was not right for "police officers to investigate each other".
I have no confidence whatsoever.
Over the years, I was beginning to have a level of trust, we had the investigation and the court case... I was beginning to have some confidence. Now I just don't know what to believe anymore."
You can't have police officers investigating each other. It's proven that's not the right way to do things.
More top news
Malaysia Airlines' website has been hacked by a group proclaiming support for the so-called Islamic State.
Prince Philip has been awarded a knighthood by Australia - sparking a political row in the country.
A "crippling" and "potentially historic" blizzard is set to hit the US, possibly leaving up to 30 inches of snow.