I fly through Schiphol all of the time and I have opted-out without any issues before.
They had me walk around it, and they patted me down US style. The person on duty with a clipboard was asking people why they opted out and I explained to them that I do not feel comfortable that the machines are safe and that cancer runs in my family and I would prefer to not have exposure to ionizing radiation.
I am from The Netherlands and being able to speak in the agents native tongue probably helped as well.
They had me walk around it, and they patted me down US style. The person on duty with a clipboard was asking people why they opted out and I explained to them that I do not feel comfortable that the machines are safe and that cancer runs in my family and I would prefer to not have exposure to ionizing radiation.
I am from The Netherlands and being able to speak in the agents native tongue probably helped as well.