The Ministry of Home Affairs (MHA) is looking for a high-tech warning system which can detect aggressive or suicidal behaviour among prisoners and suspects, allowing officers to step in before it is too late.
To find out what is available in the market, the Ministry has put in a Request for Information (RFI) for a "Human Behaviour Early Detection System".
This will allow it to assess the feasibility, performance and cost of such a system.
"There is a need for remote round-the-clock surveillance of a room with automated, near real-time detection of suspicious, aggressive and suicidal human behaviours," the RFI documents state.
Similar systems are being explored elsewhere.
The US National Institute of Justice commissioned a study to develop a prototype sensor system which can measure an inmate's heart rate, breathing and general body motions without it being attached to the prisoner.
This warning system will alert prison officers if an inmate's heart rate or breathing exceeds pre-determined limits.
There were 61 cases of assault in Singapore prisons last year, 40 of which were attacks between inmates. The rest involved attacks on prison staff.
Earlier this year, a 43-year-old man under arrest for stealing attempted suicide in prison using of a piece cloth torn from his clothes.