Investigation into the cases against arrested film actress Pori Moni, businesswoman Helena Jahangir, film producer Nazrul Islam Raj and models Piasha and Mou is on the final stage, additional IGP and CID chief Mahbubur Rahman said on Tuesday. Speaking to reporters at his office here Mahbubur Rahman said CID has been investigating 15 cases against the arrested persons. The submission of the reports before court is expected to start in next one and a half months. Read: Shakib Khan at odds with acting association's stance on Pori Moni Asked about the drugs seized from the houses of Pori Moni, model Faria Mahbub Piyasa and others, the addition IGP said evidence of narcotics were recovered from their possessions. “Chemical and forensic tests are being done to find out if those are narcotics at all,” he said. When asked about the source of the seized drugs he said different sources were mentioned. But no matter from where the drugs came from, it is illegal to procure or stockpile these drugs, he said. Read: Narcotics Case against Pori Moni: Hearing on bail, remand petitions Thursday Pori Moni and Raj were arrested by Rab following separate raids from Banani in Dhaka on August 4. Earlier on August 3, Rab arrested Helena Jahangir from her Gulshan residence in the capital. The DB police arrested Piasha and Mou from the city on August 2 on charges of blackmailing people with objectionable pictures.