(30) Biometric categorisation systems that are based on natural persons’ biometric databiometric datameans personal data resulting from specific technical processing relating to the physical, physiological or behavioural characteristics of a natural person, such as facial images or dactyloscopic dataArticle 3(34), such as an individual person’s face or fingerprint, to deduce or infer an individuals’ political opinions, trade union membership, religious or philosophical beliefs, race, sex life or sexual orientation should be prohibited. That prohibition should not cover the lawful labelling, filtering or categorisation of biometric databiometric datameans personal data resulting from specific technical processing relating to the physical, physiological or behavioural characteristics of a natural person, such as facial images or dactyloscopic dataArticle 3(34) sets acquired in line with Union or national law according to biometric databiometric datameans personal data resulting from specific technical processing relating to the physical, physiological or behavioural characteristics of a natural person, such as facial images or dactyloscopic dataArticle 3(34), such as the sorting of images according to hair colour or eye colour, which can for example be used in the area of law enforcementlaw enforcementmeans activities carried out by law enforcement authorities or on their behalf for the prevention, investigation, detection or prosecution of criminal offences or the execution of criminal penalties, including safeguarding against and preventing threats to public securityArticle 3(46).