The party cadres and leaders led formation of human chain in their respective regions.
The participants raised slogans demanding cancellation of the NEET and condemned the state government for not getting exemption in "conspiracy" with the Centre.
The DMK leader Dayanidhi Maran said there should be "permanent solution," as advocated by party working president M K Stalin and not exemption from NEET for "a year or two," which the State government was "attempting."
He told reporters that police preventing him from proceeding further was also to stop him from visiting the Katcharoyan lake at Edappadi in Salem which was desilted by his party workers with help from local people.
The Leader of Opposition, who was detained in a hall in Coimbatore, was released later in the evening.
The DMK cadres staged protests against the police detaining their party chief.
The cadres reportedly had desilted the Salem lake yesterday.
Till the state gets exemption from NEET, the protest would continue in different forms, he said.
The leaders of alliance parties of DMK - TNCC chief Su Thirunavukkarasar, MMK chief M H Jawahirullah too participated in the agitation here.
The DMK had decided to hold a state-wide human chain protest today at its district secretaries meet here on July 20.
Adopting a resolution on NEET at the meet, presided over by Stalin, the main opposition slammed the BJP regime at the Centre for "shirking" its responsibility by not sending the bills to the president for his approval.
In February, the assembly had passed two bills seeking to ensure continuation of the present system of admission to the medical courses in the state.
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