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Schools are required to allow students to be released for religious programs. This does not mean schools do not have the ability to create policies that protect the school's instruction time.
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[§302A-1139] Religious education. (a) The department shall provide for the release of, and shall release, any pupil in any public school from attendance at the public school for a period not to exceed sixty minutes each week during the school year, on such days and during such school hours as the department shall designate, for the purpose of receiving religious instruction from the religious organization of the pupil's choice when the release is requested in writing by a parent, guardian, or other person having custody or control of the pupil. Actual attendance at the sessions of the religious instruction shall count as attendance at the public schools for all purposes where attendance forms the basis of computation.

(b) The privilege of this release shall be withdrawn by the department in case the pupil does not actually attend the sessions of religious instruction. No teacher of the public schools shall participate in religious instruction during the school hours for which the teacher is employed to teach in the public schools, and no public funds shall be used directly or indirectly for religious instruction, at any time when its use would otherwise be required in connection with the regular program of the school. [L 1996, c 89, pt of §2]

All school districts, regardless of whether they are required by law to allow released time, should implement good policy and be prepared for when a released time program may approach the district. The time to set the policy is before an active program is pressuring the district. Research polices the district can implement to protect teachers' and students' instruction time. Set polices that limit disruptions to students and the ability for proselytization to occur, impacting other students of faith or no faith. A more detailed write-up on school board policies can be read here.