An alibi (from the Latin, alibī, meaning "somewhere else") is a statement by a person, who is a possible perpetrator of a crime, of where they were at the time a particular offence was committed, which is somewhere other than where the crime took place. During a police investigation, all possible suspects are usually asked to provide details of their whereabouts during the relevant time period, which where possible would usually be confirmed by other persons or in other ways (such as by checking phone records, or credit card receipts, use of CCTV, etc.).