Comedian Bharti Singh and her husband Harsh Limbachiyaa reached NCB office on Saturday for questioning. The duo was summoned by the narcotics agency in a drug-related case. The development came hours after NCB had conducted a raid at their residence in Mumbai. This is the latest in a series of raids conducted at residences of Bollywood celebrities. Earlier this month, actor Arjun Rampal and filmmaker Firoz Nadiadwala were also quizzed. Over the last few months, NCB has cracked down on the use of drugs in Bollywood. Actor Rhea Chakraborty was arrested for allegedly procuring drugs for Sushant Singh Rajput. The 28-year-old actor was granted bail after spending nearly a month in Byculla jail. Deepika Padukone, Sara Ali Khan, Shraddha Kapoor and several others were also asked to join the probe.