Human rights associations condemn the picture as disturbing.
The group, representing friends and family members, says the boys' identities must be kept private and criticises the police's act of putting them in handcuffs.
DAP veteran politician claims there is an attempt to implicate him in a bribery scandal based on allegations that former PM Mahathir Mohamad had offered him RM1 billion for his support.
Saying a person is presumed innocent until pronounced guilty by a court, MP N Surendran says the practice is in breach of the constitution and could invite civil suits against the enforcement agencies.
He flees when police van stops due to brake failure on Jalan Paya Terubong, Penang.
PKR secretary-general appears in court with hands held behind his back as if he is in handcuffs.