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The form also requires that students opt-out of teachers, staff or administrators displaying or distributing toys or symbols used in teaching or highlighting gender identity or sexuality.

Boren said the group first started creating opt-out letters to address content from conservative media group, PragerU. The letters have now been modified to address the new social studies standards.

School districts in Florida have enacted similar opt-out forms, and few parents use them. In Polk County, for example, data shows fewer than 1% of the roughly 100,000 enrolled students use the policy.