It depends on the sensor and probably the state of the subject. This is called "liveness detection" and there is an article I found explianing the basics at: ht

It depends on the sensor and probably the state of the subject. This is called "liveness detection" and there is an article I found explianing the basics at: https://www.thalesgroup.com/en/markets/digital-identity-and-security/government/inspired/liveness-detection https://www.thalesgroup.com/en/markets/digital-identity-and-...