Satish Seth Kaithal, Oct 26 (UNI) Under the drug-free district campaign, under the orders of Superintendent of Police Manpreet Singh Sudan, the Kaithal police are continuously tightening their grip on drug smugglers. In this connection, the district police arrested five drug smugglers in four separate cases, seizing 37.77 grams of heroin and 54 kg 864 grams of poppy husk from their possession, and the truck, car and bike used in drug smuggling.