Abstract: The object of research in this article is the activities of a person who had left fingerprints and the activities of a law-enforcement officer using a mobile device generating iodine vapour aimed at the detection of a person suspected of having committed an offence, and the treatment of the detected fingerprint with ozone-air mixture which would decolourise it. A complex of a mobile device for treating fingerprints with iodine vapour, photographic and video equipment, and an ozonator will increase the effectiveness of investigative activities of p[erative units during law-enforcement intelligence operations. The research is based on the dialectical method of cognition, general scientific methods: observation, experiment, comparison, description, measurement, etc., and general logical methods and research techniques. The scientific novelty consists in the creation of a way to use iodine vapour and ozone-air mixture to treat fingerprints, which would help to get the suspect’s fingerprints quickly, without disarranging the evidences, without any traces after the registration of a fingerprint, and without the seizure of the object bearing the fingerprint. Such a mechanism used during law-enforcement intelligence operations would help identify the person suspected of having committed an offence.