The court remanded him in police custody for two days after the cops sought for a five-day custody.
The cops escorted Rahul in a wheelchair.
The police arrested Rahul on Monday after registering a case against him under the Narcotic Drugs and Psychotropic Substances Act.
Rahul was on life support after a late-night drinking binge on June 1.
His late father Pramod Mahajan's secretary Bibek Maitra had died on the way to the hospital.
Coverage: Tragedy strikes the Mahajans, again
Photographs: Manan Vatsyayana/AFP/Getty Images (L) and Sondeep Shankar/Saab Press