The four accused who were arrested on April 11 were working as pharmacists at various medical shops in the city.
The arrests were part of an investigation into the fake certificate racket which was busted by crime branch in January this year.
Police had then arrested 13 persons, including the chairman of a paramedical organisation, and the chairman of a Pune-based Madhyamik Shiksha Parishad, which is not recognised by the state government.
The students completed the pharmacy courses and used the qualification certificates to get jobs as pharmacists, they said in a release.
The four arrested persons are identified as Kamlesh Patel, 23, Jagdish Choudhari, 42, Vazaram Choudhari, 36, and Chunilal Choudhari, 50.
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