The judge also issued a show-cause notice to two eye-witnesses, who were declared hostile during the trial, for "hiding true facts from the court."
Additional Sessions Judge Raj Paul Singh sent Sanjay, who belongs to Bihar, behind the bars for life and also imposed on him a fine of Rs 1 lakh, which it said "shall be paid to the family of the deceased as compensation."
"I have gone through the cross-examination of witnesses and the counsel for the accused could not breach their credibility. Further, as per FSL report, nitric acid was detected to be ingested on the clothes of the deceased persons.
The prosecution case was that Sanjay was working in a steel and alloy factory in Bawana in north west Delhi.
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On October 24, 2009, he threw acid on Dhananjay and his brother Akshay, who were working in an adjacent plastic factory, leading to their death by ingestion and burns.
The complaint was made by Rishi who was the eye-witness to the incident and also worked with the victims.
After arrest, Sanjay pointed out that he had taken nitric acid from his factory, where it is used to dissolve rust from wires, and had thrown it on the victims.