Dhaka Metropolitan Magistrate Court Judge Begum Yeasmin Ara passed the order after Investigation Officer (IO) AFM Asaduzzaman sought permission in this regard.

The IO said the drug test is necessary to learn whether the suspect had used any stimulating drug while committing the crime.

Also read: O-level student ‘rape, murder’: 3 suspects freed

“We need experts’ opinions after testing Dihan’s blood samples,” he said.

On January 9, Law enforcers released three youths after interrogation over the matter. The victim was “sexually assaulted” and “killed” on January 7 in Kalabagan.

also read: O-level student ‘rape’: Victim laid to rest in Kushtia

Police arrested her alleged boyfriend Dihan and three of his friends.

The victim had gone to a friend’s house in Kalabagan for group study, family sources said.

Her father filed a case against Dihan on Thursday night, accusing him of sexually assaulting and then murdering her.

Also read: O-level student ‘raped, killed’ in Dhaka

Dihan, who is alleged to have raped and killed her at his family flat in Kalabagan, gave a confessional statement before a Dhaka court on Friday.

Dhaka Metropolitan Magistrate Mamunur Rashid recorded the statement and sent him to jail pending further hearing, according to an officer of Kalabagan Police Station.

Also read: O-level student 'rape, murder': Suspect Dihan confesses before court

The court fixed Jan 26 for the next hearing.

Meanwhile, doctors performing the autopsy on the victim found evidence of rape.

After completing the autopsy on Friday, Dr Sohail Mahmud, head of the forensic department at Dhaka Medical College, said she died due to excessive bleeding in her vaginal and anal areas.

Also read: O-level student 'rape, murder': Case filed, 1 shown arrested

Samples were also collected for DNA profiling and to determine whether any anesthetic drug was administered to her.

Dr Sohail added that the exact cause of death could only be confirmed once the autopsy report is out.

Also read: O Level student's autopsy reveals evidence of rape; death due to excessive bleeding