Doctor Arun Kumar Shrama, technician Jhamanlal, tout Purushottam and Kamaljeet were arrested from Banke Bihari Charitable Trust from Rajendra Nagar colony last night for running the sex determination racket, ASP Triveni Singh said.
On a tip off that the sex determination racket was operating in the area, a trap was laid, he said.
As a part of the scheme, a pregnant policewoman accompanied by two others was sent posing as a patient for sex determination, the ASP said.
Singh said that the ultrasound machine has been seized.
All the four accused have been sent to jail this morning.