Lol when u apply for police certificate in DPO officer or SSP office they send a file to police station of ur area to verify ur details, residency and criminal record. To do that a constable may visit ur home to verify that u actually do live at that address. Once they are satisfied and find no criminal record in ur name they send file back to DPO/SSP office with clearance and DPO/SSP office than issue you a clearance certificate.
So i was telling talking abt part where local police station gets involved sometimes u have to manually accelerate things by going there personally and checking on progress otherwise they will do that on their own will and whenever they feel like