CADDO, Okla. (KTEN) — Oklahoma parents will be asked to sign a new piece of paperwork for their student athletes starting this school year: A biological sex affidavit.

Oklahoma Republican Gov. Kevin Stitt signed the Save Women's Sports Act into law in March. Here is what Senate Bill No. 2 requires:

"Prior to the beginning of each school year, the parent or legal guardian of a student who competes on a school athletic team shall sign an affidavit acknowledging the biological sex of the student at birth."

Caddo Public Schools Superintendent Lee Northcutt said he was surprised by the new requirement.

"I just felt like it was something that we don't really deal with, so why force this, and why have it?" he asked. "According to their rules, why every year do we need to do this paperwork?"

Any student who does fails to have a signed biological sex affidavit will not be allowed to participate in school sports.

The Save Women's Sports Act is intended to keep biological males from participating in women's sports.

Tamya Cox-Touré, executive director of the American Civil Liberties Union of Oklahoma, said in March that the legislation "violates the United States Constitution and federal civil rights law, puts Oklahoma at risk of losing federal funding, and harms transgender youth... all to solve a problem that does not exist."