I'm trying to find a way to increase privacy and conservation.

Hi. That's a very good point. The movie police use privacy glass with a one-way effect. as I understand it, it's an off-the-shelf solution. But this effect can be obtained if you use a special one way privacy film https://www.window-film-shop.com/window-film/privacy-window-fi/one-way-privacy-win-film. There is a detailed description of how the one-way privacy effect is formed and which films can be chosen. As I understand it, there are several color options - bronze and silver. You have to see for yourself and choose

Thanks to the author for the question. I have a similar problem and I was also interested in privacy and one-way effect in the police rooms.I have windows on the first floor and I want to choose one-way privacy film for the windows. Thanks for the information and advice.