Lucknow, Dec 14 (PTI) JD(U) leader Dhananjay Singh has described Samajwadi Party chief Akhilesh Yadav's "Codeine Bhaiya" jibe at him over the ongoing codeine-based cough syrup case as "laughable", and said the former chief minister should raise issues with seriousness and after doing proper research.

A crackdown on smuggling and the sale of highly restricted codeine-based cough syrups in Uttar Pradesh and the ED's money laundering probe into a wider interstate and cross-border racket involved in illicit manufacture and distribution of such syrups has sparked a political blame game in the state.

Opposition parties have been attempting to link the accused in the case to functionaries of the ruling BJP and its allies.

The Samajwadi Party chief had recently targeted Singh, a former MP from

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