Reiterating his demand for a probe by a High Court judge, Amarinder said it had become more important as the name of an Akali MLA had figured in the racket.
"Why is Badal running away from a judicial probe?" he asked adding "this is not an allegation made by us but is the revelation of a senior Akali leader about his own party MLA."
"Can anybody expect Badal to be impartial under such circumstances?" asked Amarinder.
Amarinder accused Badal of trying to politicise a serious issue concerning Punjab's future generations.
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He said given the seriousness and enormity of the issue it would be in everybody's interest to have a judicial probe into the matter.
The Punjab Police had recently busted a massive drug racket seizing 600 kg of chemicals.
Arjuna awardee wrestler Jagdish Bhola and his four associates had been arrested in connection with the seizure.