"Friction ridge identification is established through the agreement of friction ridge formations, in sequence, having sufficient uniqueness to individualize". Friction ridge identification is also governed by four premises or statements of fact:
People can also be identified from traces of their DNA by DNA fingerprinting, from their teeth or bite by forensic odontology, from a photograph or a video recording by facial recognition systems, from the video recording of their walk by gait analysis, from an audio recording by voice analysis, from their handwriting by handwriting analysis, from the content of their writings by their writing style (eg. typical phrases, factual bias, and/or misspellings of words), or from other traces using other biometric techniques.
Sometimes, manufacturers and film distributors may intentionally leave subtle forensic markings on their products to identify them in case of piracy or involvement in a crime. (Cf. watermark, digital watermark, steganography.)