Police and Rapid Action Battalion (RAB) in separate drives arrested four people and seized 80,000 pieces of Yaba tablets from Pahartoli area of Chittagong city and New Bridge area under Karnaphuli thana of Chittagong district on early Friday.Police officials said acting on a tip-off, Police launched a drive in the area at about 8:30pm and arrested the three along with 50,000 pieces of Yaba tablets from their possession.Earlier, RAB-7 acting on tip-off conducted a drive in New Bridge area under Karnaphuli thana at around 6:30pm and arrested a drug peddler along with 30,000 pieces of Yaba pills.