"A police team had questioned the witnesses, coaches, wardens in view of FIR registered on the complaint of Narsingh Yadav," Crime Investigation Department (CIA) officer Indervir, who had been appointed to probe the matter said.
"We are taking statements from witnesses, wardens, coaches and also taken in possession few utensils," he said.
He, however, said that Jitesh, the fellow grappler of Narsingh, who had been named by the wrestler in his complaint will be interrogated later.
However, his supplements have reportedly been found to be clean.
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WFI President Brij Bhushan, who was at the SAI Centre, said that Narsingh has kept his views before the NADA which is expected to announce a decision today.
After seeing the condition at the SAI Centre, he was of the opinion that anything can happen here. However, SAI Centre does not come under the purview of the WFI which can not do anything in the matter.
The Wrestling Federation of India (WFI) backed Narsingh but announced that Parveen Rana would replace him in the squad for Rio de Janeiro, a move that was approved by the sport's world governing body -- United World Wrestling.
"I have always maintained that there has been a conspiracy against me. If I am cleared of the charges, I will go to Rio. I have identified the boy who was seen contaminating my food. I have given a detailed complaint to the police," Narsingh had said after filing his complaint yesterday.
Narsingh himself desisted from taking names but WFI President Brij Bhushan Sharan Singh revealed the alleged saboteurs while talking to the media yesterday.