Who brought the angle of drugs into the Sushant Case, what is the complete truth of Rhea Chakraborty and drugs?

Ever since the CBI started investigating the Sushant Singh Rajput case, new angles are coming out. Now drugs are a new angle that is being explored.  Who brought this, why is the CBI doubting Rhea Chakraborty's claims and which film got more dislikes after Sadak 2, watch this video to know