Independent and hospital laboratories participate voluntarily in the college's evaluations.

Establishes a system where private colleges and universities can voluntarily participate in the program.

"My understanding is all the players participating in the camp were there completely voluntarily," he said.

No one who didn't voluntarily participate had any tips withheld.

According to the school, over 80% of the student body voluntarily participates in community service programs.

Students participate voluntarily in the program and stay about a month.

Last year, students at schools with uniform policies were invited to participate voluntarily.

It does allow, however, for persons under the age of 15 to participate voluntarily.

Last year, more than 300 schools participated in the program voluntarily, he said.

To conduct a clinical trial, scientists need people to participate voluntarily.