It has produced a DVD, titled Considerations for Safe Restraint, following recommendations made by an internal review instigated after Roger Sylvester's death in custody.
Sylvester - who was diagnosed with mental health problems - died in 1999 while in police custody in hospital, after being restrained by Met police.
The DVD - made by Pukka films - uses CCTV footage and dramatisations to demonstrate the difficulty of restraining violent prisoners.
It will be made available to mental health and local community groups and could be used in inquests, according to a spokesman.
The Independent Police Complaints Commission estimates that more than half of all deaths in police custody are of people with mental health problems.