1. A method for controls on persons in possession of an identity document comprising a machine-readable zone containing a document number and an electronic chip in which an authentication biometric datum of the person is stored, the method comprising: at a first step implemented by a first control device, acquiring a first biometric datum on a biometric feature of the person, acquiring the number of the person's identity document by reading the machine-readable zone of the identity document, and recording, in a remote memory, the number linked with the person's biometric datum, and at a second step implemented by a second control device, acquiring a second biometric datum on the same biometric feature of the person as the one on which the first biometric was acquired, from the second biometric datum, retrieving, in the memory, the number of the identity document corresponding to the person's biometric feature, from the number of the person's identity document, accessing the content of the electronic chip of the identity document and retrieving the authentication biometric datum, and performing biometric authentication of the person by comparing the authentication biometric datum stored in the chip with a biometric datum acquired by the second control device.