But Shajarizadeh, who fled to Canada in 2018 after three arrests for flouting hijab law, worries that women like the amusement park worker may now be targeted with face recognition algorithms as well as by conventional police work.After Iranian lawmakers suggested last year that face recognition should be used to police hijab law, the head of an Iranian government agency that enforces morality law said in a September interview that the technology would be used “to identify inappropriate and unusual movements,” including “failure to observe hijab laws.” Individuals could be identified by checking faces against a national identity database to levy fines and make arrests, he said.Shajarizadeh and others monitoring the ongoing outcry have noticed that some people involved in the protests are confronted by police days after an alleged incident—including women cited for not wearing a hijab.“They were arrested at their homes one or two days later.”Although there are other ways women could have been identified, Shajarizadeh and others fear that the pattern indicates face recognition is already in use—perhaps the first known instance of a government using face recognition to impose dress law on women based on religious belief.Mahsa Alimardani, who researches freedom of expression in Iran at the University of Oxford, has recently heard reports of women in Iran receiving citations in the mail for hijab law violations despite not having had an interaction with a law enforcement officer."