Sentul police chief Beh Eng Lai said the two men were detained at the Kuala Lumpur traffic police station after being taken there to undergo a urine test.

Prior to that, the 25-year-old car driver was believed to have fallen asleep and rammed his vehicle into the back of a 4WD truck in front of him in the incident at 12.30pm.

“Following the collision, the lorry hit the back of a motorcycle in the same lane, causing the rider to fall. However, no one was injured in the incident,” Beh said in a statement here today.

He said the policemen who arrived at the scene saw the suspicious behaviour of the two men and took them to the station for the urine test.

“The duo tested positive for methamphetamine, ketamine, Erimin 5, amphetamine and ganja.

“Both were investigated under Rule 10 of the Road Traffic Rules 1959 and Section 15(1) of the Dangerous Drugs Act 1952,” he said.