At Hagerty High School in Oviedo it's an "opt out" system as the Orlando Sentinal reports.
"...students will be required to take part unless their parents object.
Officials attempted to start the finger-scanning program at Hagerty earlier this month, but Superintendent Bill Vogel stopped it abruptly after several parents complained that they knew nothing about it and hadn't been given a chance to say no.
Some parents said their children had been threatened with punishment for refusing to have their fingers scanned initially to make a master image they would be scanned against every day. About a dozen parents already have refused to allow their children take part."
Bullying tactics have been used here in the UK as well.