The Detective Branch of police said they have seized a batch of brownies laced with marijuana "for the first time in the country".
Three students of different private universities were arrested with the brownies on Wednesday from Mohammadpur and Paltan areas in the capital.
"We are now thoroughly investigating the matter," said Mishu Biswas, additional deputy commissioner of Detective Branch Ramna Division.
An Instagram page "thebrownieguybd" was being used to sell the brownies.
A case has been filed with Mohammadpur Police Station under the Narcotics Control Act.
Earlier last month, police arrested seven students of different private universities with hallucinogenic drug Lysergic Acid Diethylamide (LSD) in separate raids in the capital.