In a statement today, Mahathir said there were longstanding concerns that many bus drivers may be using drugs, posing serious risks to passengers and other road users.

“I propose that bus drivers should be made to undergo a drug test before starting their journey (for the day).

“If they test positive, they should not be allowed to drive and their salary must be deducted.”

Mahathir also suggested that bus drivers who refuse to take a test be barred from driving.

His remarks come in the wake of Monday’s horrific crash involving a chartered bus transporting UPSI students from Jerteh, Terengganu, to the university’s campus in Tanjung Malim, Perak.

According to police, the bus landed on its side after it hit a Perodua Alza. The crash resulted in the deaths of 15 passengers, while 33 others were injured, including the bus driver, his attendant and the four passengers in the vehicle that was hit.

Mahathir acknowledged that implementing mandatory drug testing could lead to operational challenges, including a shortage of qualified drivers and possible disruptions to services. However, he believes such issues can be managed.

“All these challenges can be overcome.”

In January, tourism, arts and culture minister Tiong King Sing said the ministry plans to make urine screening tests mandatory for tour bus drivers before they begin their duty for the day.

He said this step was necessary to ensure bus drivers do not use drugs.

Tiong added that police investigations have found that some bus drivers consumed drugs after being forced to work for 12 hours straight.