Why couldn't Nancy Jaax bring her security

card with her into the higher level?

Nancy Jaax is a veterinary pathologist in United States. She was the one to bring out the cure for the most infectious Ebola virus.

Explanation:

Based on this true story, Richard Preston wrote a novel name 'The Hot Zone' which describes how Nancy worked on this disease, and how it finally resulted in a success.

The thing about why Nancy Jaax couldn't bring her security card into higher level is a totally different story. It might have possibly got to do with the United States service rules and regulations.