A Taiwanese man caught driving on a suspended license with ketamine in his system won a partial reversal, because police never explained why they pulled him over in the first place.

• The man had already lost his license for two years over drunk driving, then drove anyway and tested positive for ketamine.
• Regulators hit him with a heavy fine, revoked his license, and seized his plates for two years.
• He fought back, arguing that drug traces in urine do not prove he was unfit to drive at that moment, and that the traffic stop itself was illegal.
• The Kaohsiung High Administrative Court found the lower court never established what legal grounds police had for stopping him.
• The case was thrown back to the district court for a fresh hearing, with judges stressing that police cannot stop drivers without proper cause.

Outlook: The retrial will hinge on whether police can justify the stop, and the ruling raises the bar for how officers document roadside checks.