Special Judge Sangita Dhingra Sehgal directed police to trace the source of money and conduct the probe from all possible angles and file an additional charge sheet in the case within six weeks.
The order of the court came on the plea of BJP MP and accused Faggan Singh Kulaste for a probe into the matter to find out the "real beneficiaries".
"In view of the facts and circumstances which have emerged on record, I am of the considered view that the investigating agency/officer was bound to investigate the case from all angles in a fair and impartial manner leaving no loopholes, clear all knots of doubt and instill confidence in the public mind," the court said.
It also reminded the investigating officer of the undertaking given to the Supreme Court last year to find the source of money in the matter.
"The investigating agency is reminded of their undertaking and the directions of Supreme Court contained in order dated September 2, 2011 to find the source of money," the judge said.
Regarding an unidentified man in a yellow shirt who can be seen in the controversial CD, Kulaste's counsel Anil Soni said the police had not tried to trace him even as he could be seen actively using his cellphone to contact Amar Singh from Argal's house.
"It is impressed upon the investigating agency to make sincere efforts to trace the identity of the man wearing yellow shirt as seen in the video footage...
And to unearth the hidden truth, if any contained in the DVD seized last year," the court ordered.