Chief Constable Gary Roberts says one in five incidents police are called to involve people with mental health issues.
He was giving evidence to Tynwald's Social Affairs Policy Review committee on Friday when he made the claim.
Mr Roberts was asked whether the number of such incidents had fallen after police began working with other agencies.
He said so far there'd been no change, although he did expect the figure to fall in future:
American company plans three-wheeled Island tour
A group of American motorcyclists will be touring the Island next year.
Dominos advertises for staff to work in new Ramsey store
The Island's newest fast food outlet is advertising for staff as it prepares to open.
Cost of new patient transfer buses queried
How many patient transfer buses have been bought in the last three years?
What consideration's being given to getting rid of tax discs?
What consideration is being given to getting rid of paper car tax discs?
Can people on benefits still get support if they're treated privately?
Can people on benefits still get support if they only get private treatment for their health conditions?
Manx student speaks in House of Commons
The Island's youth has been represented in the Houses of Parliament.
Below average rainfall in October despite unsettled weather
The Ronaldsway Met Office says total rainfall was slightly below average for October, despite it being an unsettled month.
What's the government doing to encourage people to buy Manx produce?
An MHK wants to know what the government is doing to encourage people to buy Manx produce.
