When contacted by law enforcement, you have three options: (1) speak with law enforcement; (2) refuse to speak; or (3) ask for time to respond after you have had time to consult with an attorney.
It is always advisable to contact an attorney prior to speaking with law enforcement. You do not have an obligation to speak with law enforcement. If you would like to speak to an attorney, you should be polite and ask for contact information and advise the law enforcement agent that you will have your lawyer contact them.