The couple was travelling with their four-year-old child but after the investigation Immigration and Checkpoints Authority found three slabs of 10 Erimin-5 tablets.
Under the Environmental Protection and Management (Vehicular Emissions) Regulations, it is an offence to use or permit the use of any smoky vehicle on the road.
According to Misuse of Drugs Act, if a person is found guilty of drug trafficking, the person could face a long prison term, caning, and even capital punishment.
ICA said if anyone is convicted of importing chewing tobacco, he will be liable to a fine of up to S$10,000, up to six months' jail or both for the first offence.
Singapore's Immigration and Checkpoints Authority expects heavy traffic in both directions from Feb 16, the first day of Chinese New Year up to Feb 20.
Maximum penalty for illegal meat distribution is a S$50,000 fine and a jail term of two years. For second-time offenders, the penalty is up to S$100,000 fine and three years' jail.
Gopu Jaya Raman, a 32-year-old Malaysian man of Indian origin escaped the death row in Singapore for possessing drugs as he was acquitted by the country's Apex Court.
Singapore Police Force said that several parts of Singapore may be closed between 2am to 4am due to the two-hour long exercise at Woodlands Checkpoint.
Singapore's Central Narcotics Bureau (CNB) arrested 99 suspected drug offenders in a five-day island-wide operation from January 21 to 26, seizing drugs worth more than S$52,000.
A 60-year-old repeat offender in Singapore has been arrested again for vandalizing a police vehicle, threatening a police officer with a wooden pole and punching a retiree.