If you believe that you are the subject of a police investigation, you should to visit a criminal lawyer to discuss the situation. It will be important to learn what obligations you have when dealing with police, and also what obligations the police have when investigating you. The police may want to discuss the investigation with you. In most circumstances, you are not required to speak to them. You should not even consider speaking to the police until you have received legal advice. You should speak with an experienced criminal lawyer before you decide how to proceed.