The 30-year-old was India's number one choice under the bar before slipping down the pecking order, behind Norway-based Gurpreet Singh Sandhu, in recent times.
Paul did not take calls when Reuters contacted him.
"It's now between him and NADA. He has to decide whether he wants his B sample tested," Das said.
"But of course if he needs guidance, the federation is always there."
Subrata Rao's sample A has tested positive||The former India captain was tested by National Anti-Doping Agency in March ||Subrata Rao now has to decide whether he wants his B sample tested, an official told Reuters