A method system, and device for identification by an identification tag in which a request to a control module of the identification tag is transmitted from an interrogation device via a contactless interface of the identification tag, so that the control module accesses identification data stored in a memory module assigned to the identification tag. The identification data are transmitted via the contactless interface. Body-specific identification data of the wearer are captured and transmitted to a verification module by a measuring device assigned to the identification tag, or a sensor, and/or an analysis device. The transmitted body-specific identification data is compared with the identification data stored in the memory module by the verification module, to confirm the identity of the wearer. The identification tag is injected and/or implanted under the skin of the wearer. The identification tag can be in particular an RFID and/or NFC tag.