do chp offices have to have a public restroom?

2 weeks ago I was pulled over for my license plate light being out. I had just left a meeting at our Elks lodge. The chp officer smelled alcohol on my breath. I blew under the legal limit. I am handicapped and I use a walker. Since he could not do a field sobriety test he wanted a blood test. He did not give me a choice he just told me I was doing it. Well he took me to the chp station. it took about 1 1/2 hours to get the blood test and paperwork done.I asked him twice if I could use the restroom and he said no. I was released to a friend and once again I asked him if I could use the restroom. He said no in front of my friend.He stated that they store weapons in the bathroom and I could not use it for this reason. My blood work came back and I was way below the legal limit and my dui is being dropped. So my question is, don't they have to provide me with a bathroom, especially since I am handicapped?