A grand jury is convening in Brooklyn to hear evidence in the case against two detectives accused of having sex with a teenage woman who was a drug suspect, a source said.

The detectives, Richard Hall and Eddie Martins, have had their guns and shields taken away and were reassigned to desk duty after the 18-year-old made the accusations that were first revealed in The Post last month.

Hall and Martins allegedly handcuffed the woman after stopping her with marijuana and an anti-anxiety drug in a Bath Beach park on Sept. 14. The woman said one of the cops raped her and both forced her to perform oral sex on them after driving her to a Coney Island Chipotle parking lot. She also claims she was handcuffed.

The detectives have told colleagues that the sex was consensual, according to police sources.