Pasir Bedamar assemblyperson Terence Naidu has been asked to explain his conduct following his detention at a nightspot in Penang on Thursday.
Perak DAP chairperson Nga Kor Ming said the party leadership at the state and national level wants to be informed of the "factual situation" surrounding his detention.
"I would like to assure the public that DAP takes seriously the conduct, character and integrity of its elected representatives and that they should be exemplary in their ways as people who have been entrusted by the people to lead them," said Nga.
Terence allegedly tested positive for illicit substances while at a nightclub in Penang. He was released from police custody after a brief detention period.
According to the police, 36 out of 47 people detained during the raid tested positive for drugs.
These individuals are being investigated under Section 15(1)(a) of the Dangerous Drugs Act 1952 for consuming or administering "dangerous" drugs.
If found guilty, they can be fined up to RM5,000 or jailed for up to two years.
Terence, 54, is a two-term Perak assemblyperson and a lawyer.