When did wearing an anti-ISA T-Shirt become a 'crime' in Malaysia?

Because he wore an anti-ISA T-shirt....

According to the 27-year-old Malaysiakini subscription executive, the police considered him a possible threat to the VVIPs present, which included Deputy Prime Minister Najib Abdul Razak.

Relating his ordeal, Oliver said he and his friends had visited the event after seeing a banner in KL Sentral regarding the bash, which was taking place at a nearby car park.

The three were passing through exhibition booths when the police confronted them and escorted Oliver - who was clad in a T-shirt which bore the words 'No to ISA' - to a beat base in the vicinity.

"I asked why I was detained and they asked why I wore this T-shirt. I asked what was wrong with the T-shirt and they said I could be a threat to the VVIPs present."

"They gave me two options: Remove the T-shirt or remain at the police booth until the VVIPs leave. I refused to remove my shirt and chose to stay," he said. - Malaysiakini, 4/11/2008 - Deepavali bash: Man held over anti-ISA T-shirt

What has happened to freedom of expression in Malaysia?