How to tell if a mirror is two way

I’m not sure if this is the right place, but I’m concerned about personal safety and surveillance at work.

I tried the fingernail test on the bathroom vanity mirror at work, and my fingertip touched its reflection. Usually, a standard mirror should have a gap between the two, but if I can touch my reflection, it might be a two-way mirror.

I’d like to know:

Can a standard mirror fail this test?
How can I confirm if the mirror is a two-way mirror?

A) I turned off the light and shone my phone’s light at the mirror. The light wasn’t very bright, but it reflected back a little. Unfortunately, I don’t have a flashlight.

B) The bathroom mirror has a thick, circular frame that sticks out about three inches, similar to this one.

Any help would be appreciated. I’m concerned about being spied on or recorded.

If you suspect a mirror might be two-way, observe the area behind it for any signs of suspicious behavior, such as people moving or shadows. Two-way mirrors are often used for surveillance purposes, so if you notice someone on the other side observing you, it’s likely a two-way mirror.