A routine traffic stop in Taipei's Wanhua district turned into a drug case after a rider gave police someone else's identity — bad news for the 31-year-old now facing prosecution.

• Officers on patrol stopped a man using his phone while riding a scooter early in the morning.
• His nervous manner prompted a records check, which showed the ID photo did not match his face.
• He then admitted his real name and agreed to a saliva drug test, which came back positive for methamphetamine.
• Police are puzzled by the lie — he had no warrant out, no suspended licence, and no other case against him.

Outlook: The case has been passed to Taipei prosecutors on drug charges, and police say they will keep stepping up checks for drug-impaired driving.