E.g:

 Mr Shanmugam said MHA had commissioned a survey last year involving 2,000 residents. The majority of respondents agreed or strongly agreed that the death penalty is more effective than life imprisonment as a deterrent against using firearms in Singapore (70.8 per cent), committing murder (70.6 per cent) and drug trafficking (68 per cent). MHA also commissioned a study of a sample of non-Singaporeans who are likely to visit Singapore and therefore might potentially encounter the country's laws and penalties. The study, conducted in 2018, found that 76 per cent of respondents believed that the death penalty is more effective than life imprisonment in discouraging people from committing serious crimes in Singapore, such as murder, smuggling of firearms and drug trafficking.For example, MHA found that there was a 66 per cent reduction in the average net weight trafficked for opium in the four-year window after the mandatory death penalty was introduced in 1990 for trafficking more than 1,200g of opium. In the four years after the death penalty for trafficking more than 500g of cannabis was introduced in 1990, there was "a 15 to 19 percentage point reduction in the probability that traffickers would choose to traffic above the capital sentence threshold"