There r many reasons though hardly any evidence in this case...
1. Acc. to the police the house was locked frm inside on the fateful night, n there were no deliberate attempt to break into the house. 2. No mother, whose only "daughter" is killed, can come in media time and again and speak without crying. 3. She was an "adopted" child. 4. NA test hsn't been conducted on Talwar. probably because talwar bribed the police. 5. Arushi's room were cleaned before forensic team arrived. 6. hw can in the middle of the night, in a house with AC, hence no stray sound, 2 brutal murders went unnoticed, while the rooms of arushi n talwars were immediately next to each other. 7 and since talwar found no one to blame firmly he blamed his own compounder.
