MANILA, Philippines - A lawsuit filed by a group of parents against the Department of Education's sex education program has been nullified after the original complainants decided to drop the complaint.

Lawyer Jo Imbong, who led the group of parents who filed the case, said they made an oral motion to dismiss the case since it still lists former Education Secretary Mona Valisno as a respondent.

Imbong said they cannot substitute the new education secretary, Bro. Armin Luistro, as respondent since he had already said that he will review the implementation of the sex education program.

The lawyer said the dismissal of the case was without prejudice, meaning the case may be filed again in the future.

Last month, Imbong's camp asked the court to stop the education department from implementing the program since it was unconstitutional.