NCB on Saturday conducted a raid at comedian Bharti Singh and husband Haarsh Limbachiyaa's residence in Mumbai and has summoned both of them. NCB is probing alleged drug links in the entertainment industry following actor Sushant Singh Rajput's demise. NCB has so far raided residences of TV celebrities like Sanam Johar, Abigail Pande and Bollywood actor like Arjun Rampal.