Met Police officers receive mental health training
3 June 2014 Last updated at 16:10 BST
The head of the Met Police has said that mental health is a top priority for the force.
Last year, a review into the way officers handled people with mental health issues found they were treating them "like criminals" and using "too much force".
Since then the Met Police has placed mental health teams in some custody suites so people can be assessed and referred for treatment quickly.
Commissioner Sir Bernard Hogan-Howe said: "Our officers are not experts but we have helped them recognise mental health issues and how to get the right help."
BBC London's Home Affairs Correspondent Guy Smith spoke to mental health worker Jane Wood, Sean Rigg's sister Marcia Rigg, Lord Adebowale, the chief executive of the charity Turning Point, and Sir Bernard Hogan-Howe.