Bathinda police have arrested four persons and recovered over 5.5 kg of opium in two separate cases. One of the accused, a 24-year-old man, claimed to be a student of Punjabi University, Patiala, though the police are yet to verify the claim. He also had a previous attempt-to-murder case registered against him, the police said.The SP added that Ramanpreet had allegedly supplied the opium to Ranveer.