Kadapa: The district police has invoked the Preventive Detection (PD) Act on five international red sanders smugglers on Wednesday. The accused were identified as Sheik Mustafa, Vidhi Sakthivel, Viswanathan, Kamesh Mathur and Y Bhaskar. District SP Attada Babujee said that the PD Act was invoked as red sanders smugglers were indulging in repeat offences.