Enforcement officers at the Kuala Lumpur International Airport (KLIA) are believed to be using secret codes such as “lembu” (cow) and “durian” in facilitating a syndicate bringing in groups of foreign nationals into the country through a modus operandi known as “counter setting” or special counter lanes.

According to a source from the MACC, the code “lembu” referred to the bribe payments received from the syndicate, while “durian” referred to the...