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Based on a quantitative survey among students, this article looks at the way police officers carry out stops and identity checks, particularly focusing on the selection criteria with which they operate. Physical appearance and sex relate significantly to the probability of being stopped at least once in one’s life. Race also appears to be significantly related with this possibility in a logistic regression model that includes variables for transport and leisure practices. Beyond these discrepancies, one can see group differences in how police stops are carried out and in the frequency with which they are repeated, pointing to the creation of groups which are seen to constitute « police property ».