The drills were held at UC Merced.
It was the perfect time to do it since there weren't many students on campus after commencement ceremonies two weeks ago.
Crews from UC Merced police, fire, and public health ran through different scenarios with the help of 10 actors in lab coats.
The campus police chief says the research university does have dangerous chemicals on site, so this type of training is essential.
"We plan, we prepare, we bring external partners on campus to do training and drills like this," says Chou Her. "So when something does occur, everybody is ready. Everybody is prepared. Everybody knows contacts and we can readily respond."
Notices were sent out ahead of the training to limit campus impact and avoid alarming anyone who might think it was a real emergency.